When the penis goes up into the vagina letting sperm find the eggs often causing pregnancy. Sex usually happens in the closet or anywhere when people from the opposite sex or same sex are "horny" see horny for detials.
The thing you can find on every dude's computer. So soft but STIFF. Wet Juicy but Dry and slighty moist busting all over her face BOOOOOOOOM every time YES OH GOD YES -----> O