Love, however, does offer a GM yet another opportunity to wreak havoc on a character's life. Be it through a kidnapping, murder, or, my group's personal favorite, disagreement and argument. It can allow the characters to be happy, miserable, and confused all at the same time, just like in real life. If the players have enough common sense and respect for each other love in gaming can be a fantastic thing, and I'm all for it. Characters should have relationships, and facets of them should be role-played out to give the characters more dimensions.
Sex normally follows love, as well as being independent of love.
I would dare say that there is more sex than there is love in both life and gaming. For many it is an uncomfortable subject, more uncomfortable than most. Also, it is not an appropriate subject for younger gamers, who may neither understand, nor be able to control themselves. Ideas of when someone should copulate should not be presented to someone through a gaming group. Of course not.