Sexual Relationships 
Sexual Health 
Is my boyfriend cheating on me with my sister? If so, how could I catch them?
CloudedMind Xper 2
My boyfriend of about a year always gets nervous around my sister. I noticed he's been talking about her a lot. He asks a lot of questions about her. When we talk about her, he always has something bad to say about her, but he still talks a lot about her.. He comes over to my house all the time. Mostly to play his video games and lock himself away in my room. However, my sister comes over and walks around in her sports bra and panties (sometimes even naked because she takes baths and just walks around like that). It's frustrating. Long story short, our schedules are all jacked up. He works morning and day shifts, and I usually work closing shifts. When I leave for work, he doesn't leave. Sometimes he is home alone with my sister. He always says he doesn't do anything and doesn't even leave my room... but I'm starting to feel like something is going on... When I got home from work, of course my sister had already left. (It seems she only comes over when I'm gone at work and my boyfriend is there... ) Well when I got home, I found a pair of my underwear in the guest bedroom that she stays in (I guess she's been wearing them) and also a towel with cum stains on it. I' m wondering how that could even be possible... and I'm also grossed out she's wearing my underwear. They honestly looked disgusting... I was wondering, if this is actually going on. HOW could I find out for sure if they're really doing anything? I'm tired of feeling like this.
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What Girls & Guys Said
18 37Toss him out. If you can't trust the guy, or your sister, then move on. It's not gonna work anyway.
And what's he doing at your house when you leave anyway? He should go back to his own place if you're going off to work.
I like @OlderAndWiser idea. :) Set a trap.
Easy way to find out the truth. Text your sister " hey *insert boyfriend name* told me everything "... Text your boyfriend "hey my sister told me everything ". Then sit back and watch everything unfold.
I've tried stuff like that it doesn't work. They usually play the innocent card or they are actually innocent.
Damn. The only way to truly know is if you catch them in the act. So I don't know, if you have money buy one of those cheap nanny cams or a voice recorder and set it up in your house so you can get actually evidence. It is a red flag you found cum stains on a towel and your underwear in the room your sister stays in.
Yes, I took the advice to get a hidden cam. Hoping to find results ASAP. Thank you for your comment.
set up hidden cameras or hire someone
I gotta admit that would be FUCK UP. They´re rules to be respected and if you don´t follow them don´t expect to have a happy ever lasting life. Trust your instinc.
So she's done this before with previous boyfriends?
Maybe flirted, but as far as I know.. she's never done anything
I see. Well all you have here is speculation, nothing solid to go off of. Put up cameras or something so you have proof so you can put your worries aside.
Since she goes around the house half naked it sounds like she just likes the thrill and attention.
Yeah I see what you're saying
Thank you.
It's kind of like how some girls see if they can eye a cute guy walking by. Just a cheap thrill to see if maybe he likes you too.
make a plan to go to work but don't go to work and come back
yup that's nice idea
that's the only way for you to do it baby unless you hire a private detective to do it
Well there's no telling when they actually do it.. I'm gone for more than 6 hours a day and I'm between that time if I just come home randomly? I mean what are the odds I'd actually catch them like that.
I know it will take more than one time baby but if it bothered you this much and it with me I would have to catch
Hm, yeah :/ well thank you for the advice I really appreciate it.
your welcome sweet girl and I'm sorry
I don't understand the problem.
When you leave for work, HE leaves with you.
There is no staying there by himself, especially if your sis comes over spontaneously.
My parents allow him over, even while I am gone.
Wait, are your parents home when your boyfriend and sis is?
Usually my mom is but my dad works all the time. And my mom will sleep at day since my dad is a shift worker. So technically, they are alone.
unless he's sleeping with your mom
You know what? That would be extremely fucked up... but I honestly can't see that happening at ALL. Unless she was shit faced but she doesn't drink at all.
only way to find out is camera
direct confrontations with both of them. dear if it's now then never
Possibly, yes.
Hidden camera, hidden voice recorder can help
Convince them to join you for a threesome. Pay attention to the two of them and see if they automatically know where each other likes being touched, etc.
Have a threesome with your sister! What excellent advice!
@OlderAndWiser lmfao
@OlderAndWiser --Thanks
See if can come home early one day, you may be able to catch them.
Bunch of crazy ass paranoid people on this site telling you to get cameras.
hahahaha lol
Talk about juicy stuff lol just by reading all this it is seriously weird that you consider him your boyfriend, why come to your house when you are not even there, it's pointless and are you not close with your sister? You've already found evidence that there's something, you should dump him if you want concrete proof how about hiding one of those spy cams? They are cheap to buy if not that leave your phone with recording on simple
Well, in previous comments I answered that he stays over while I'm gone because he can't afford wifi or cable at his house and all he ever does is play video games. He throws fits when I start telling him I think he should go home and says he's gonna be "bored to tears" which is slightly understandable but it also doesn't help how my parents allow him over whenever...
fine, i'll just say it here: your relationship with your boyfriend is pretty much over already since you started doubting him regardless of weather he did it or not here are the scenarios of how it goes from now : 1) you confront him about this and he will deny that he's screwing your sis and break up with you after sometime might start dating your sis. 2) he will admit and start dating your sis openly 3) say he's not cheating but if you ask him, he'll say how can you even think stuff like that and put the blame on you instead 4) he wants to have a threesome with you and your sis i don't think there's any scenario where you can get back together with him. by the way what kind of guy can't afford wifi HE HAS A JOB, it's just an excuse to stay over at your place, doesn't he have any other friends?
Well he moved from out of town to follow me here, now he lives in a small trailer and barely affords his rent + car note + other living expenses with the job that he DOES have..
before i say anything, did you reported my last reply or GAG team removed it themselves?
No, I didn't report anything. What happened?
the GAG team deleted my response so i thought maybe you reported it so i was sort of pissed ^^"
First comment? That's strange. But I didn't report it
Ya it just happened lol by the way i can't message you unless you follow me so can you follow me? I'd like to talk more and be friends if possible
Okay
Sorry but they are fucking. You don't leave a guy (any age) alone with a naked tease offering. Wake up..
Dude showed be able to control himself and better yet, when he sees his gf's sister walking around naked and shit, he should leave. Not just hang around like a spineless prick.
Should*
Cum stains? This is a very big evidence, sorry but he's cheating on you with your sister.
Buy a tiny cam from online and set it up in the room
Set up some cameras or something to regiter them at least sound to have a track
Something is definitely going on. Time to ditch the dude and ditch the sister. I was in a similar situation. My girlfriend used to always bring her sister to my house since she used to carpool with her to work but one weekends, my girlfriend worked and the sister didn't and neither did I so for some reason, my girlfriend used to insist on leaving her sister at my house. Long story short, ttied seducing me, failed, got kicked out. by the way, your sister seems like a whore no offense, I mean she knows that her sister's boyfriend is over and she's walking around the house naked and in provocative clothes and shit, fucking grosses! And if your dude is cheating, f him and find someone better, you know you deserve better also.
Are you sure it wasn't just white discharge? Maybe it was that
But anyways to find out either look through the trash for used condoms or count how many you have then after a week recount.
For some serious evidence place a videocam in your room or the guest room. Have it facing towards the door so you know who came into the room. Or place a voice recorder since those are easier to hide