Avan Mogridge has also told a court the alleged victim was making the story up because she was embarrassed.
The 32-year-old Deepcut army recruit has told a court she made up her story after a couple caught the pair in the bushes as they walked their dog.
Mogridge is accused of dragging the teenager into woodland near Guildford Spectrum on the morning of October 22, 2016.
The defendant, of Stamford, Lincs, denies two charges of rape, two charges of sexual assault by penetration and one of making a threat to kill, Get Surrey has reported.
Mogridge said he lost his virginity to a woman but he added: “Since then, my relationships have been with men.”
Mogridge said he had a 13-year-relationship with a man which had broken up by mutual agreement: “Since then, I have had sex with five or six men,” he said.