The most arousing sex I have ever had was with my boyfriend an a good girlfriend of mine. It was unbelievable! It was my birthday, and I was at a nightclub with my best friend and my boyfriend. All of a sudden I realized I was getting turned on by her, Sandra tells us. “We started touching each other, and I asked my boyfriend if he would like to get in on the fun. I didn’t have to ask twice. It was the best of both worlds.