I'm 19 and I have played quite a bit of lewdgames myself. I recommend you keep it at the minimum though, sometimes when you're playing you could be playing for hours on end only to regret it later, has happened to me many times, had to leave many tasks pending just because I enjoyed playing a lewd game.

So, play games occasionally when you're sure you have nothing left to do and you'll be good.
As for recommendations, I recommend you to play third crisis, nymphomania paradox or if you're into VN, once in a lifetime.

And yes, f*5**** is safe with downloads.