Is this cheating or experimentation?

I'm going to re-write your question without using masculine or feminine assignments.

"A person in a committed relationship wants to hook up with another person without their significant other's consent. This person says it's not cheating. It's experimentation. Do you agree?"

Looks like someone's looking for an excuse to cheat.

It's cheating, whether it's a girl or boy.

If her boyfriend is not okay with it then, yes, in my book that is cheating.

It's both. Just because it's experimenting doesn't stop it being sex with another person, therefore it's also cheating which ain't okay.

If the boyfriend is unaware then it is cheating. Just because it's with another girl doesn't make it any less justifiable.

My ex-boyfriend had an, eer... heated night of passion, with annother boy whilst we were together and then bragged about it to me. Despite his protests I counted it as cheating.

If she records her results and everything properly, maybe with graphs and stuff, then it's definitely experimentation.

I bet the boyfriend wouldn't get away with "experimenting" on the same girl.

That is cheating. It does not matter what gender you do it with.

Still cheating. Now if you asked your boyfriend to join in, it's experimentation.

Wish I was a part of such an experiment.
Me and two hotties. Would be nice...

That girl should've asked her bf to watch or participate otherwise it's cheating.

It's only experimenting if the boyfriend is invited to join

Its cheating and that is a dumb excuse. Your friend is a whore. Should start tossing tomatoes at her. I would tell her boyfriend. If this is how she gets away with cheating I cant imagine what other awful shit she must have done to him.

talk about a flimsy rationalization for cheating.

Definitely both.

I guess I'm in the minority. I wouldn't see it as cheating if my wife experimented with another woman.

A woman could never compete. We're absolutely different. It would be an experience that I couldn't give her, and nothing she experienced with a woman could take my place.

Competition isn't there.

This is pretty much the definition of cheating.

Uh cheating I guess.