I would definately say my gynecomastia has affected my sex life. I'm 19 years old, and I have a midler case of gynecomastia, kinda like in spleens avatar, maybe even a bit smaller, but still noticable. I have puffy nipples and alto there isnt too much fat I can definately feel the glands.
My point is, I'm a virgin. I dont have problems talking to girls I know, like my friends or classmates, and in general I can feel comfortable around women, but only if I'm not wearing just a t-shirt. When I go out to clubs in the summer in just a t-shirt I'd hold my hands crossed or pretend to scratch my nose, anything just to conceal my condition. During the fall and winter things arent as bad, but even wearing a thick sweater will reveal I have a larger chest, but it doesnt accentuate my nipples so much. I have no problems talking to girls or flirting a bit in a friendly way, but I certanly have a problem approaching unknown girls or really trying to pick up a girl, because I'm a bit shy, which I believe is due to my gynecomastia.
Now, I'm not too fat (I'm 180 cms, 80 kg, or 5' 11" and 160 lbs I believe) and plenty of girls have been interested in me but I've never really been comfortable approaching them or trying to start a romantic relationship.
I'm extremely self conscious when going to the beach, and I find myself trying to find excuses why I don't want to go with ym friends to the waterpart or on vacation.
I haven't really had a real girlfriend so far. My only relationship was on my school trip when I spent a night with a girl kissing (but no sex). I wore a shirt with the top 2 buttons unbuttoned and I remember how uncomfortable I felt when she started kissing my neck and going down to my chest, and I immediately got her off me.
My mates went on vacation together this year, and some great sexual experiences, even 2 friends that were also virgins and that were more shy then me and not better looking than me. My point is, I have no doubt I would have had sex for the first time had I gone with them, but I didnt feel comfortable enough to go. Even on my school trip where we spent most of the time on the beach I'd pinch my nipples to make them contract or jump in the water immidiately. By the time I got home my nipples were very red and hurting.
I know some girls don't care about male breasts, especially if it's not an extreme case, but the only opinion that matters is your own. If you don't feel comfortable in your body, if you avoid social situations or every day activities because of your breasts it's obvious that something needs to be done. In the end, it's all about self confidence, and some people, like me, just cant feel confident about themselves because of their breasts, or will find themselves obsessing over their breasts when they should be having fun. In the end, it's all about ourselves.
Now, I've had this condition since I was 12, and my father used to say it would go away but it hasnt. He said he doesnt think I have a problem, but I believe I do. My friends would joke sometimes that I have pointy breasts, and one girl said jokingly (withouth trying to hurt me) that I have bigger breasts than her. Basically, I'm tired of it affecting my life. I've already contacted several surgeons and plan to have the surgery in the next two months, preferably by early or mid September because college starts in October, and I'd really like to be able to meet new people withouth having to think about my boobs.