There is a counter side to this, and that's the women on dating websites. Maybe it is because I was older (I was 38/39 then) than some but the second guy I dated, who I wound up being decent friends with, expressed a sigh of relief on on our first date that I was obviously what I said I was in my profile. The picture was recent, I wasn't looking for a meal ticket, equally obviously I wasn't looking for an instant husband (though I did wind up with one, much to my total surprise), I was just looking to date and see what was out there. To my total surprise, since I thought it was a nice picture, I kept being told I was better looking in person. One guy I didn't click with I fixed up with a friend, and they went out for about six months.
The problems of OD are the same as meeting anyone IRL, except that the dating motive is clearer in OD. But I find that you find what youre looking for. If you're convinced that every guy is a liar only out for one thing, you'll find them in droves. If you're convinced that people are nice and this is a fun way to meet some people, check them out and say yes or no (since there's always someone else on line to check out if it doesn't work out) you'll find that. If you're only looking for a husband and nothing else, I dare say you'll find someone who is just as keen to get married but be careful what you wish for. But that's the same advice I'd give in real life.
Call me retro, but if you don't want them to shag you and leave, then don't shag them right away. Not Ruies "you can only touch my left boob on the third date" stuff, but if you're not ready or sure this isn't someone in on the same terms you are, then don't sleep with him. Again, same advice I'd give in real life.