The doorbell rang, and a thrill of exhilaration coursed through me. Tonight was the night! Lisa and I were actually going to have a threesome with another man. We had met Doug a few years ago, and had gotten to know him well during that time, becoming very comfortable with him as a friend. Doug was a bit of a flirt, and would occasionally tease Lisa with double entendres and such. Though she blushed or feigned anger, I could tell that she enjoyed the game and was excited by his attentions.

One night when the three of us were drinking together, Doug made a veiled comment about guy-on-guy sex that...