I was crazy stupid as a young man, never noticing girls flirting with me for years. I look back at the signs I missed now and can't believe I was such an idiot.
I have some excuse though, for the first 11 years of my life or so we constantly moved every 3 months, so I never really made friends or even communicated with other children (I just read books nonstop for years). By the time I hit middle school age, I started making friends but that was so new to me, that I focused on just the friend part for 3 years, and I graduated on my 16th birthday, basically missing all of high school where I might have actually started to date.
Meanwhile, I had a girl ask to sit on my lap (A friend in a group of friends I would hang out with), in a car, and was just proud she didn't feel heavy to me. I seriously had absolutely no clue at all that girls where flirting/hitting on me.
I didn't even kiss a girl till I was 19, and the first time I kissed a girl, I also slept with her (it was a random girl I met at a restraunt and I was so curious I just went up to her and told her I found her attractive lol....and she was interested!! It was not her first time at all, but I was seriously nervous.
Anyway, I never really got the dating thing down. Never mastered flirting etc. Eventually met my wife at 27 and we got married when I was 29...that is the only other girl I have been with. I guess I'm good looking (I look like my father and he was a male stripper when he was younger)....but I have never thought of myself that way..and I was pretty much clueless about sexual innuendo...or topics...or even song lyrics (I had no clue that so many songs where about sex...like Relax for instance...I didn't discover that until Zoolander and my wife told me about it lol.....it was actually the eye opening song for me that made me realize so many other songs had sexual lyrics in them.
So yeah, it's quite possible for guys to be totally clueless about sex...or at least it was for me. We (us men) are supposed to think about sex like every couple of seconds or something...but certainly was never the case for me. I do enjoy sex, and never had a problem performing...and I have always found women attractice...but I never once in my life looked at a woman and thought "Wow, I'd like to have sex with her". In fact, I've always found overtly sexy outfits a turn off...liking cute, intimate etc looks more.
Everyone is different..but sometimes I look back and am a bit sad about what I missed out on. My wife was very adventurous (with both men and women)....and much like my taste buds restricting me from so many types of foods I wish I could enjoy, my non-sexualize brain had me miss out on alot of fun as well. My wife even wanted us to experiment with other couples or another girl etc for awhile but I was not into casual encounters much and we never went there. Most guys would probably jump all over adding another girl....but I would only be ok with it if it was someone we already knew/where friends with etc..and I wouldn't be ok with bringing it up lol...so y eah....not going to happen.