it doesn't sound very nice. This entity is trying to steal your energy through intercourse, which is related to lust. I would be careful. Perhaps every night before going to bed, protect yourself.. there's a way by drawing a circle of white light around your house or bedroom.
In this book, there's a part talking about protecting yourself from negative entity. It's a free ebook. I don't know what page but the mantra to ward off entity works as I've tried it many times. The mantra is called Bellilin "divine wind that cast away darkness"
http://belsebuub.com/free-spiritual-...tual-knowledge
Goodluck..