Something interesting happened, but I am not sure what to make out of it!?

Yesterday when I was doing BWD, it got pretty intense, I could feel like having sex. Then once the meditation was over, I could still feel the feeling of sex, but still tried to wash it and get up from bed. As I was getting up, I felt some energy pinning me down, and then having sex with me for the next 2-3 minutes. After that I could feel the energy fading, much like the man ejaculates. 
Can someone enlighten me on what actually happened? Because for the first time I experienced this.