Idk if it was just where I grew up but most of us (4 of every 5) guys all experimented all the time. My older sisters bf used to walk around the house hard as a rock when everyone left and he finally said one morning.. “ you stare at it enough why don’t you suck on it for me.” I think he was bi because he always woke me up rubbing my dick to get me in the mood. He used to cum within 10-15 seconds of me suckin it.
If someone allows you to suck their penis, it is their expectation that you will suck them until they ejaculate inside your mouth, with you swallowing all of the semen. It’s simple math. In exchange for his penis inside your mouth that provides the necessary orgasmic stimulation, you’re given in exchange his semen for you to ingest. Intimate exchange with body fluid ingestion. That’s sex.