Yeah, I would have to agree; this sounds like a science experiment. In trying to figure yourself out, maybe.
Which isn't a bad thing necessarily--if it is constructive--but should still absolutely NEVER come at the expense of someone else. Indeed, that would be truly selfish. That would make it wrong.
Anyhow, it doesn't sound like you're getting good advice in real life. And based upon the little I immediately grasp, this is how I would return the original question: with more questions.
Humor me.
#1. Are your friends aware of your present relationship?
Because, if so...
#2. Aren't your friend suggesting then that you should be unfaithful?
Or...
#3. Aren't your friends suggesting then that you risk damaging the relationship of someone else?
With all due respect: don't do this.
In fact, maybe try to set the example for this group of people instead. Should the subject ever arise again, tell them, plainly: no; I'm not going to use someone else, even to figure myself out.
If you are unhappy in your present relationship, try fixing it or ending it. With kindness.
