Sex is a human right in the sense that one has the right to want, to consent to and to engage in sex, and should not be penalised or prejudiced for doing so.
This does not remove the right to obtain your sexual partner's willing consent, nor does it permit you to harass people for sex.
You have do not have an entitlement to sex - otherwise that essentially gives you legal dominion over someone else's body without their consent.
With reference to sex workers and choice, I most certainly do not judge people who choose to engage in sex work. But very often it's not the nuanced choice that people would happily believe - the myth of the "happy hooker" is pervasive and extremely damaging. How many sex workers do you know who sat at school and dreamed of trading their bodies for money? I suspect that number would be vanishingly small.
Finally, how does demanding equality and respectful treatment of women reconcile with buying them for sex? As a society if you are keeping a group of women as sexual objects, literally just temporary vessels for a stranger's physical needs, then how does this align with educating men and raising boys and teens to view women as people? Either you can't uphold your philosophy that women deserve not to be sexualised and objectified, or you have to "other" sex workers and give out the message that it's OK to sexualise and objectify some women because they've chosen to allow it. Neither work.