If it is not completely straight and completely satisfying, respect is soon cremated in the heat of ill-spent passion, and the ashes of respect are the burning embers of scorn. Such an ill death of something fine is seldom worth the hazard. This is a good way to get an autograph from an admired one. Affectionate sex is groovy. A good way to share the room rent, some people think.
Nothing interferes with friendship like sex, and nothing interferes with sex like friendship.
Intimate sex is wow. Sexual fluids make a good cement, and they also produce babies. This was from the section on Classifying Relationships. Consequently, I won't touch it. Ok, after long searching I turned up this pretty good mini-essay on the subject, which is meant to explain things to the gals.