I truly believe that it is a matter of your girl liking what you do for her as well as accepting feedback from her on how to improve her pleasure as well as yours, I had a 20 year old when I was in college and she was a neat freak. Some,times that is good. obsessive neatness is not. My girl liked reverse cow girl, After her riding me for quite a while, I would ask her for a little oral contact, basically suck me dry.
She immediately refused, my dick tasted "yucky" yes it was the 80's. That stiff she did not care for was her pussy juice, very little fluid was me.
had to jump in the shower and scrub off the smell and taste if I every wanted to cum. So she started to fuck with a wet towel next to the bed.
She wanted me to fuck her ass when a girl friend told her how great it felt I asked if she wanted a hazmat crew on standby. That was my last date with her...