if u r into casual radom sex then u cannot know your partner.....I enjoy hooking up on grindr...road trips are the best...pop in ...fuck & go...dont even wanna know their names...almost like when away from home all rules dissapear...anywhere will do...side of the road...resaurant toilets...basicaslly when u have sex with as guy u r having sex with everyone (rather kinky whem im riding a mb imagining how mnuch cock he's had) he has had sex with...sort of...so u need to rely on science/modern medicine...I've had condoms break in my teen years when I was in far too much of a hurry & skimped on lube...prep of taken as advbised is as good as condoms...i could never go back to condoms...occasionally use them when the bottom insists but thats it...i get tested regulartly..and rush to the doctor if i suspect anything is amiss....so far...fingers crossed I'm all good