There is no medicine that can prevent the transmission of STDs. So whatever it is they're taking doesn't work.

Gilead is just coming out with a gel containing an antiretroviral that they plan on releasing in third world countries where use of condoms is low. It's not intended for use in developed countries where condom access is better and culturally accepted and where people are theoretically better informed.

I have had similar experiences. I think they are talking about preemptive antibiotics. Which I suppose would help suppress the most widely transmitted STDs, which, BTW, can be transmitted via BBBJ and DATY. Someone will probably note that this will not help with virus based STDs, but viruses are much harder to transmit. Don't get me wrong, I am not advocating BBFS, the risks are greater than the benefit when I run my numbers.