I totally agree Bee35 - a couple of years ago, when I was single, I had a look on the dating websites and, like you, was pretty shocked. Think a lot of people just trawl them for free easy sex.
One of my friends ran a Sex and the City style column for her local paper and went on a different date each week - and met some complete weirdos! On the other hand, another of my friends signed up to a site (Match.com) and proposed to the first woman he went on date with... just two months after they met (they were both in their 30s). Just a case of luck I guess...
As for sex, whether you meet someone through a website or in the pub, if someone's too pushy then don't feel under pressure. I'm pretty open-minded when it comes to sex and have, erm, been around the block a few times ;) but if I ever feel pressurised then it's over there and then!
(BTW I'm a woman in my mid-30s and finally in a 'normal' relationship ;) with a great fella I met in a kebab shop at 1am (how embarassing!)... gives me hope that dating and romance without hopping into bed on the first date still exists and that some men want more than just a quick fling)