Or members of your non-preferred gender, for those of you with alternative tastes.
Bisexuals can go play in another thread. 
Gay man here, so of course I check out guys. But I can also appreciate an attractive female - aesthetically if not sexually. I have a straight male co-worker and we have fun pointing out attractive members of our preferred genders to each other.
I don’t. I’m a firm believer that beauty is in the eye of the beholder. There’s something visceral about it; I could not predict or explain why I find certain women attractive, it just happens.
Without that, there’s no point in checking out men. I don’t try to figure out which women other guys will find attractive, either.
I am a man and I do not. I can barely tell what men would be attractive to people that are into that. I just don’t have that innate ability. I learned to figure some of it out by brute force like comparing people to those in TV and magazines but there seem to many exceptions and I can’t tell quirky attractive at all when it comes to other men.
OTOH, a moderately attractive women can walk past my furtherest field of peripheral vision while I am concentrating hard on something else and my head will snap for a quick glance (and maybe more) before I know what happened.
It is an extremely big difference.
No.
I check out other women’s clothes to see what looks good on people with similar body types to mine and just in general because I like clothes. There’s nothing sexual about it but I do get shoe envy/lust on a regular basis.
I have checked women of all types out shamelessly. Men nah!
Oh yeah if by “checked out” you mean had a second look at a man with a pretty girl and thought “what she see in him”.
I pretty much don’t. A man does not catch my eye in the same way a woman does.
I check women out sometimes, but I’m not sure why I do. It’s not sexual, because I have no interest in them that way at all. Maybe it’s partly a “scoping out the competition” thing, but I’m not usually consciously assessing them for threat value. I just like to look at them, sometimes, I guess. I appreciate pretty and beautiful and sexy stuff, and sometimes that’s a woman.
I spend a great deal of time at the gym working out and when I see an impressive male specimen of course I ogle him a bit.
Regarding physical attractiveness, this is me as well. I really have difficulty picking up on what makes a guy attractive or not (outside of physical deformity or something), but my head whips around and I can lose my train of thought if a woman who’s even mildly cute walks by.
I do check out guys’ fashions/style, though: hair style; cut, fit, and color schemes of clothing and accessories; body language and posture. I objectively appraise their “look” without being able to tell if the man himself looks good or not… and it’s done so that I might get some ideas for my own style. Pity the pale, slight men with high hairlines who happen to have good personal style, they’ll think I’m checking 'em out.
I’m a straight male. I definitely notice good looking men, not that I’m attracted to them sexually but " Wow, if I was that good looking I’d have a lot better luck with women" sort of way.
Yeah, envy in other words.
Oh, ditto. I see a guy who’s clearly goodlooking and knows it, I envy him a bit. Lucky bastards, every advantage helps.
Gay guy - I look at women all the time, especially pretty ones. I can appreciate female beauty, even if it doesn’t attract me. I also look at things that make women women, usually breasts, cleavage, female-shaped hips and bums. Again not because I find them attractive, but because they’re features I don’t see in my own gender. My thought process goes something like “Hey, look at that woman’s breasts. Breasts really are quite strange, and those look a decent size. I wonder what I’d feel if I was straight and looking at those…” and so on.
Yup, all the time. I’ll definitely notice if a woman has a great ass/beautiful smile/nice hair, and I’ll take a good look. It’s just an aesthetic appreciation, and it’s definitely a different kind of reaction than if I saw a good-looking guy.
I check out women all the time. Especially those who just seem to be totally put together all the time. Some women have a knack for getting the right hair, makeup and clothes (and accessories) all the time.
Nope. I’m another guy who just can’t judge what makes a man attractive or not. And I don’t find men appealing to look at anyway; neutral to repellent is more like it.
Yes! Women are beautiful, why wouldn’t I want to look at them?
Yes, exactly. Also to scope out hair/makeup. I saw a cute hairstyle on our bartender last night and have decided I’d like something like it. So my checking-out gets me out of fashion ruts on a regular basis.
My checking out was also to help me get a clear idea of what was age appropriate for work as I got older. I didn’t see any reason to jump into matronly clothing at 40 but I wanted to make sure that I was gradually dropping my skirt lengths and doing whatever else I was supposed to do in order to not end up looking like one of those cringe-worthy 50 year old women that dress like they’re 20. It helped to see how other women my age dressed and get a gut reaction to it.