You make babies. Unless it’s man on man sex, or woman on woman sex. I don’t know what happens on man on alien. If I ever see an alien, I’ll ask them if they have a vagina. If they say yes, then I’ll ask them if they want to make half human and half alien kids. Since they aren’t from this planet, I don’t have to pay child support.
Might get famous too, the first written down man of having sex with an alien. Homosapians might of had sex with aliens, but they didn’t write it down.
Speaking of aliens, the TV is calling me. Ancient Aliens should be on. Maybe they will talk about an ancient dirty drawing.