As someone who was circumcised (for medical reasons) well into my twenties I can attest sex (and masturbation if anyone cares) is worse afterwards. Why wouldn't it be, you've lost thousands of nerve endings. Evolution gave us a foreskin for a reason... it made reproduction more pleasurable and therefore more likely to occur. Moreover, it's not only less pleasurable, it's actually a different feeling. It's more about 'pressure', I can't really describe what I mean in words, guys who've had sex both intact and cut will know what I mean. It's my pet theory as to why American men are more into anal than Europeans, as it's all about a hole as tight as possible. You also have to relearn to masturbate as it's a different experience, and for me at least, I had to almost rewire my brain to find sex pleasurable again as again, it's just very different. Others might report differently.
Blowjobs are way better when you're circumcised though. Before, I never really cared for them apart from the whole dominance aspect. Now, I have that and a more physically pleasurable experience. And, it's definitely cleaner. Even if you wash there daily, it just is and you notice the difference immediately. Trust me. Anyway, my two cents. If I was American and had a son, I wouldn't get him cut.