The one thing I wonder about—and will never know—is what sexual sensation I might have missed by being circumcised. Any guys on here who were circumcised well after becoming sexually active want to fill me in on the difference?
This kind of thing is subjective, but since you have no point of reference I may be able to illustrate. The difference in sensation of the glans is similar to the sensation of first entering a swimming pool compared to being in the swimming pool for a few minutes. As you slowly enter the water, you have a very stark and vivid sensation of the point where the water touches your skin. It is intense and it pulls all your focus. Once you've been in the water for a while you still feel the water, you can still sense when part of you is out of the water v.s. in the water, but the hypersensitivity is gone. Similarly, when you are uncircumcised and pull the foreskin back you can feel the difference in temperature immediately and it is really breathtaking. Every sensation is very vivid, and too much can become uncomfortable. When you're circumcised the sensations are still there, they are just as pleasurable, but the intensity is dialed down. The bonus is that you are fully in contact with your partner during intercourse, and more intense stimulation that would be uncomfortable if you were uncircumcised is still very pleasurable. When you are running or bicycling, you can sometimes feel the sensation of your glans rubbing in your underwear and it is very pleasant. Trying the same thing uncircumcised, assuming you are not a permanent foreskin retractor and have developed some toughness, can be downright painful.
As far as preferences go, it really comes down to the individual - some uncircumcised guys want to be more vigorous with their lovemaking and find it difficult, some circumcised guys are unhappy at how rough they need to be to get off. I never really liked having foreskin even from a young age and I felt like the foreskin rolling back and forth during sex was getting in the way, using condoms was a pain and what I preferred was holding the foreskin retracted as much as possible, which was a hassle, especially when lubricant made getting a solid grip difficult. The most mind-blowing sex I had was after getting circumcised, no more quick-wash-ups before oral, no more getting sore from intense hand jobs, the sensations during sex were just on another level. Because I could feel my glans all the time, and finally realized my desire since childhood, I was wildly horny for a couple of years. Best decision ever!