Skinny dipping with another guy who's not your boyfriend?

Anonymous
OK, I'm going to avoid details and keep this simple.

I have a long distance boyfriend.

My neighbor is a friend of mine who is my age. He has a girlfriend.

We were talking super late last night (the neighbor and I) and we decided it might be fun to go skinny dipping this summer in his pool.

I woke up this morning and had a thought, if I went skinny dipping with my friend all by ourselves, would it be considered cheating in a way? My neighbor's girlfriend is going to be in Europe for a month in the summer and he was like "it'll be our little secret."

What do you guys think? Is it ok or not?
Updates
+1 y
OK, to make this clear, there is no making out, or touching, or whatever. It's just swimming (at a 6 ft radius).
Updates
+1 y
OK, I understand now that it's now cheating. Blame my upbringing in Europe. I went to nude beaches with friends all the time before I moved here. My definitions of cheating has expanded. So thank you for your comments.
Skinny dipping with another guy who's not your boyfriend?
8 Opinion