i wouldnt trust anybody claiming to be on prep...and especially not a MB who's sole aim is to sell his services ....I'm on prep and thats all I need to know...if for some reason I decide to fuck when off prep then out come the condoms...more than once I have declined to proceed with a mb when upon inspection (i get him totally naked with the lights on and inspect his hole, penis, mouth/teeth/tongue, check for swollen glands)...if any of these checks fail...he's out...one particularly memorable (not) mb had weird growths around his butt hole...totally gross