Dear John: This past June, I was introduced to my best friend's brother, "Marcus." I had just broken up with my boyfriend at the time, and I wanted someone I could hang out with. I never had sex in mind. Although I had never tried any illegal drugs before, I took one with him, and we ended up in bed together. He's the best lover I have ever had. After that night, Marcus and I continued to sleep together. We were exclusive for a while. We'd have sex several times a day, every day.