Lol, rendril, that has to be one of the oldest riddles ever, seriously. It was asked by the sphinx on the road to every passerby, and she would eat every person who got it wrong. Oedipus (Poor poor guy) got it right and went on to fulfill one of the most famous Greek tragedies.... The answer is:
Got another riddle for you guys, a more practical one.
Assuming you are awesomness like me, although I sadly have not experienced it, and you are about to have the intercourse with 3 beautifull women, or men, but then you wouldn't be awesomeness like me, because I like women more, you'd be more of a female version of awesomeness... or ... ugh whatever, depends on your taste . You are not doing them at the same time, they have some sort of issue with that, like totally lame.
Anyway, the problem is that an unknown person has a STD (remember, can't spell stud without std . It could be you, could be first woman, or the last one. Luckily you have condoms, sadly enough, you only have 2.
What do you have to do, so that you will have the all holy fornication with all the nice ladies, without risking an infection, or transferring it? Remember, weirdly enough, getting pregnant in this riddle is not a big issue.
But of course, in real life, you'd be long gone, I mean... one of you has a std, get out, get out, get out, go awaaaaaaay!
Anyway, what do you have to do? ( And no cheating, like burning a tire into a mold of your phallic glory.)