just because it's legalized....it doesn't mean one has to do it...it's one's choice to choose what, how often and how much one wants to do it
just like your wine example...it's your own decision on how much you are going to consume to achieve the satisfaction that you desire
put aside those that are forced to be prostitutes..it will be another issue..but for your argument...they can choose to provide or not to provide and receive or not to receive sex service...you can choose to murder or not to murder too but you can't choose to be murdered or not be murdered
if you think they are the same...you have a serious problem
yes you are correct if you perceive the substance or matter that you are referring to is 'wrong'...i'm not trying to justify whether it is right or wrong or whether its beneficial or harmful..i'm just saying just because it's legal..it doesn't mean you have to do it...it only means you can and it's your choice to persue it