Religion usually prohibits things that have a bigger bad side or loss. For example, gambling can have a bad impact if you are addicted to it, which can harm many people. Then prostitution has detrimental sides such as the potential for contracting dangerous diseases.
However, from a political perspective, of course these two things can be profitable for the country because they can be taxed, which is why not a few countries legalize gambling and prostitution simply to be able to take these profits as state tax income.
For people who are not religious, I don't think there is a problem, they can do whatever they want as long as it doesn't conflict with the rules that apply where they live.