Okay, I'll ask The Question.

Who cares what your friends think? It's none of their business, honestly. If they are so hung up about masturbation, then maybe it's they who have the issues, hmm? You have fantasies just like everyone else, and yours are always positive and loving and based on equality, not degrading or abusive, so what's the problem?

God designed you the way you are. He made humans with the capacity to enjoy themselves by themselves. Desire is not evil; if it was, the human population would have gone extinct after Thag rode his mammoth down the mountain and proclaimed that the gods of nature had spoken to him. If what you are doing harms none, and you aren't using it to abuse others or exploit them or degrade them, again, what's the problem? The only person you are responsible to is you. And if they lay a guilt trip on you, ask them, "Hey, did you get a new job as a travel agent? Because you're sending me on a guilt trip." Ask them, if God created humans with all these capacities, why waste time worrying over something so trivial when questions like what is consciousness and what happens at the edge of space are much more interesting to ponder? lol If they want to try to pry and put their nose into your business after you tell them it's none of theirs, then maybe they're not as friendly as you think?