Sexual Relationships 
Sexual Health 
I think it’s valuable for guys and girls to learn the biological processes and physiology of the opposite. It can be as erotic as it is educational for the benefit of knowing how to better please each other.
For guys, the signs that ejaculation is close is easy. Aside from the obvious heaver respiratory and heart rates, or the deeper flushed look on the face and lips, the cowper’s gland at the base of the penis produces increased amounts of precum which discharges at the tip throughout stimulation. The testicles elevate close to the body and base of the underside of the penis while the scrotum tightens. The tip (glans head) becomes a darker purple and shiny, it also becomes engorged 4-5x the regular size.
Signs I’ve noticed on women aside from the also obvious heaver respiratory and heart rates, or the deeper flushed look on the face and red/purple lips… She feels much warmer, almost feverish feeling inside the vagina and around the vulva. The vulva and vagina turn from a lighter pink into a darker red or purple. The vagina relaxes to open up wider and elongate by more than 2x. The clitoris will become erect and become exposed outside the hood. She will become extremely wet or even a cream colored natural lubricant from the bartholin's glands will start to discharge from the vagina. Some girls will start to have their legs shake uncontrollably. Others will naturally thrust their hips and pelvic region upwards in the air without even realizing, like they are trying to thrust or push the penis deeper, even if it’s only masturbation. It’s a natural/instinctual subconscious response to fill a need.
Are there other signs I missed that girls exhibit that should help guys to take notice so that a man can better know the female body in order to be caring and satisfy?
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