If I understand your question correctly, you're a heterosexual man who's curious about sucking cock and/or eating sperm and you're worried about STD's. Is this correct? The bad news is that nothing is 100 per cent safe. However, the risk isn't as bad as many would have you believe. I'm a mature gay man who's had two or three thousand different sex partners whom I'm sure I've sucked off at least six or eight thousand times. Sure, I've picked up the clap a few times, but this is treatable and considering the huge number of sex partners I've had the risk isn't that high. As for the biggie, HIV, everything I've read and heard indicate that it is extremely difficult or probably impossible to contract this thru oral sex, even swallowing sperm. So if you want to take sperm in your mouth, go for it.