I am a 24-year-old straight guy who recently broke up with my girlfriend of more than four years. One of the reasons we broke up was a general lack of sexually compatibility. She had a particular aversion to oral sex—both giving and receiving. I didn’t get a blowjob the whole time we were together. Which brings me to why I am writing: One of my closest friends, “Sam,” is a gay guy. Shortly after breaking up with my girlfriend, I was discussing my lack of oral sex with Sam and he said he’d be willing to “help me out.” I agreed, and Sam gave me an earth-shattering blowjob. I was glad to get some and had no hang-ups about a guy sucking me. Since then, Sam has blown me three more times. My problem is I am starting to feel guilty and worry I am using Sam. He’s a very good buddy, and I’m concerned...