I'm very male, and quite straight. I've got a girlfriend, the greatest human being I've ever known. When I'm not actually talking to her, I spend a lot of time thinking about her.
And yes, for a large portion of that time, I'm thinking about having sex with her, or anything that would lead up to it. Alright. Fine. I'll give you that.
But I also spend a lot of time just thinking about HER. As an entity. Her personality, The way she talks, the way she writes, her drawing, and how much I just want to SEE her again...and not in the "naked, in my bedroom" way.
Further, I have a LOT of female friends. To make a point, I only have two MALE friends. I spend a lot of my time surrounded by rather attractive chicks.
I rarely think about having sex with any of them, and when I do, it's usually only because of the "polar bear syndrome" (Someone tells you not to think about polar bears, and suddenly, the thought of polar bears is present, and goes away shortly.)
They're just my friends. People I help out, and who help me out, when we're having trouble, and otherwise just hang around with.
Do guys think about sex a lot? Sure, hell yeah! And why the hell not? It's a great practice...it feels good...it has a lot of emotion attached to it, and it's a beautiful act, if treated the right way.
But is it all we think about? Not in the slightest. Not even when you're limiting the scope to when we're thinking about women.