Can Sex Therapy Be Helpful?

Hello, I am 25 years old and since I was young I noticed that the only thing that gave me a powerful sexual urge was looking at images of women in bondage. this first came across through cartoons and comic books and i became more adept at finding such material on websites when i was in my early teens. i never questioned it because it had been around since childhood, but as I grew older i became very cognizant of the fact that i was not getting off to more conventional fantasies about coitus--as in the bondage stuff just got me powerful erections to which I masturbated, I did not have to imagine myself having any kind of sexual contact with the women in question. as time went on i became more and more focused on this and eventually my rigidity in erections all but disappeared. Additionally, I have gradually lost a lot of the sensitivity in my penis (and for some reason, even my testicles). now i am in a position in which I do not know exactly where to turn. what are my prospects with sex therapy. would that help? is there any way to move from such a narrow type of sexual gratification to a more fulfilling, committed relationship. can i regain the lost sensation and the diminished sexual capacity that has become such a constant worry for me? please just need some guidance and encouragement. thanks, doctor.