Secondly, and more to your point, one could be curious as to what the experience is like without having any specific sexual feelings for the same gender. Sexuality means you enjoy the act, just performing is not enough. See also: gay-for-pay pornstars, closeted gay people in hetero relationships, non-consensual sex. An example from the study would be "performative" homosexual relationships, where someone might kiss someone of the same gender not for their own pleasure, but to entice a third person of the opposite gender.

In your world, if you have sex with someone but it ends up not being very good, you view yourself as having been raped?

I'm sorry, but conflating what someone "likes" with what is "consensual" is deeply problematic. I'd ask that you not do that.