First of all, you're talking about two extremes at opposite ends of the spectrum. A guy who only talks about sex, tries to reference sex at all times, is always asking for it, pushing for it, guilting for it is a guy who only wants "one thing". A guy who absolutely never talks about sex, brings up sex, references sex or asks about it seems cause for worry about his health and/or sexuality.
Sex is a natural part of most relationships. I think around age 17+ is when sex becomes a real issue. There is absolutely nothing wrong with wanting sex, having sex or enjoying sex responsibly and safely. It's something you have to talk about, agree on and decide together. Just because someone wants sex as a part of their relationships doesn't automatically make them some kind of perverted reprobate.