just like you can buy trash food that makes you sick, so can you buy trash sex.
if you go to a restaurant chances are you aren't going to be served the ransid shit someone found in a gutter. and even if a cheap restaurant uses cheap food sources, you still have all the options in your hand. you can still change your diet any time. you can grow or collect your own food or buy from a local farmer. you aren't forced to eat crappy food.
whereas with sex you have no options. zero. you are forced to either pay for sex with a hooker, with a 'normal' roastie or you just leave it be. your body and your mind aren't decoupled entities. if you fuck over one, the other gets fucked too. if i eat trashy food, i become trash. if you have to pay for sex, you know that you are doing so only because you are forced to. you know you only get to have sex because you just paid a filthy whore and i don't mean mainly professional prostitutes. the question you should be asking yourself is why you need that 'pleasure' in the first place. that urge doesn't come from nowhere. when you do something for your body, you aren't 'merely' doing it for your body. it's a matter of the mind just as much if not more so.