Ofcourse the COULD be a medical reason! Most women are told its all in their heads, and they suffer like that for years without seeking help. To many people going around saying pleasureless sex is normal for girls and you have to teach yourself to appreciate it. wrong! Howcome only a tinytiny minority of men have that problem, and 99 % of them have come to learn how their sexorgans work before they reach 15? how come some women are just naturally horny and orgasm easy peasy? Others still hear at 30 that it will come with practice and time..!**@!, honestly from what Ive seen so far it doesnt just suddenly happen after 15 years of sexual experience.Ofcourse the psychological aspects matters, there might be tons of boundaries that you might not even be aware of. Sexologists are usually good at solving that stuff.If you are not aware of the problem its not easy doing something about it..There might be tension, guilt, religious issues, shame, pressure to perform etc etc.. How is your sexlife apart from your bf? do you have any sexual fantasies, do you masturbate, do you get horny?? Do you feel good masturbating, stimulating your clit?If not, then yes there might be some medical issue.If its just the intercouse thing, and you are fine on your own, then I suggest psychological.