I have a problem with my new boy friend. in fact what makes me anxious is the fact that what he enjoys is just my sucking his penis and when i ask him to have vaginal sex, he is quite reluctant,,and even when he accepts ,after the sex quickly pushes his penis in my mouth for licking and sucking, is there any special way to encourage him and make him enthusiastic for having vaginal sex? in addition, i want to know the reason of his being obsessed with this kind of ejaculation and sex .