I wouldn't believe all this guy tells you. I agree BB sex is the best nothing better than cumming in a guy.
If you're in a sexual relationship with your woman and you still play about, then to be honest you need to play safe. I guess if you're engaged you enjoy raw sex with your female partner. To put her at risk is fucking stupid, selfish and you could look at a charge of GBH with intent, in other words at least 10 years in prison. While she loves you now, if she discovered she became poz cos of your hormones well you're cunted aren't you?
Either dump her and fuck raw, or keep it fantasy. I totally get where you're coming from here in relation to a female partner. Fine if people know the risks and want to convert, but convert an innocent person who trusted me 100%, I couldn't live with myself.