he says its because he had tried it before and the girl said he wasn't good.
i really don't notice if it never happens. i cant go that way anyways, so it's nothing spectacular on my end. so i don't think its always because the person is bad at it. ive had to ask guys to stop before because they were so bad lol. and they loved doing it! and im just thinking "god.... is this ever going to go anywhere? I feel like im in a continuous loop of mediocrity!"
do you think she would tell you if it was because you were bad? My thinking is that, if she does like it, she would probably rather hurt your feelings once and tell you how youre doing it wrong, than go the rest of her life w/o it. so she's probably telling the truth.