You need to ask many questions and make sure he is UD and then go for it big time for fun. I had a guy who 'trained' me for fisting and liked to take a 'dick break' to fuck me. At first I would not allow it as I knew he was Poz but after doing quite a bit of research (took me about 3 months to look everything I could up on it) I was still quite afraid to try it. LOL Finally though I decided to let fate decide and we flipped a coin for it. 2 heads yes and 2 tails no out of three flips. First couple of time were tails so he did not get to but as fate loves to change, the third time came up 2 heads. True to my word I let him fuck me and it was BB all the way. From then on I decided, hey, it is already done, so quit flipping and just took his loads for the 'dick break'. I probably ended up with at least 10 or 11 loads from him. It has now been since last year in March the last time we were able to get together though and I am still Neg as of my last testing.