Was in a relationship once for about a year. A couple of months after being together, she confided that she wanted to have a child. So we agreed to certain terms. So we started having unprotected sex, lots and lots of it. She wouldn't get pregnant. She was becoming more and more frustrated, so we started to have more and more unprotected sex. She would take her temp, ovulation tests, etc .... She even paid to have me tested, apparently its cheaper than testing a woman. I passed with flying colors. Eventually the relationship didn't work out. But, it kinda became like a fetish. I learned alot through all that. Like how to tell when a girl is ovulating, the creamy/sticky discharge from the vagina, the nipples get darker/sensitive, more emotional, etc...