I've only ever come once during 69. Maybe I'm just not very good at multi-tasking, but when I 69 I get so focused on pleasing my partner I not even really aware of what he's doing. Hence I don't cum. The problem is, I think he's doing the same thing. So I'm doing a lot of work to please the other guy, who isn't appreciating it because he's doing a lot work trying to please me, but I don't notice because I'm trying to please him...