If you consider it sinful to lie and have sex with other women, then, by all means end your marriage and take up the hobby or find other ways to explore your sexual interests.

On the other hand, you may feel it overall best to hobby discretely and keep those parts of your marriage you enjoy intact.  Some do the latter and seem to do fine with it.

Of course, there is always the possibility of you being found out and having to go through the hell of a divorce.  I did the latter but I think in all everything turned out for the best.

As for disease, I think that if you see good quality providers and practice safe sex, it should not be a problem.  It hasn't been a problem for me in almost forty years of hobbying, for example.

As for the question you asked in a later post about addiction, the answer is yes, to some extent.  All good things are.  The question is whether we manage it well, or not.

By the way, I think you mean that the first P is missing, as in "play" (sex) for "pay".

In marrige, there is always plenty of pay, but often not much play.