In the Wheel of Time books, there's a "magic spell" that allows a person to be "bound" to another person. It gives both special abilities etc.

The "spellcasters" (all women) are only allowed to do it to men. It's revealed later on, after a series of events that forced a woman to bond a woman, that it's because they share feelings far too much. One has sex, the other gets extremely aroused, one gets drunk, the other starts acting drunk too. The gender difference is the buffer between them, essentially, because of the difference in feelings, they can sense each other's emotions but don't share them.