I only have experience with one person that seems to have BPD. So far as I know, he was abused by a male relative when young and tells me that he was sexually assaulted by a girl when he was 15. I've become the object of his obsession in the last few months and he has become increasingly sexually aggressive with me to the point where I would say that he was hypersexual. He expressed a number of fantasies that I could only describe as paraphilia. Nearly every conversation gets steered towards his sexual needs in a very crass and crude way. At first, it was flirtatious between us and then it became overwhelming for me. I tried bringing this to his attention and how I feel about it, but it only seems to fuel a more desperate need for him to be sexually aggressive.