Yes.
As far as associating sex with the product:
The trick isn't that you'll associate sex with the product (though some do, some don't, but the phrase "everyone does, except me" is a little off to me, especially when more than one person claims it). The trick is that you'll probably pay more attention to that advert than you will others. It's similar to the reason that onboard computer alerts in many military applications/vehicles, were voiced by females (prior to female pilots/operators). Of course, it generally doesn't work if you aren't interested in whatever type of product it is to begin with. No matter how much I pay attention to the commercial for dog food with sexy people in it, I'm not going to buy dog food as I don't have a dog.
As far as the actual sale of sex:
Well, it's illegal in the States to sell sexual acts, but it is still a lucrative business no matter where you are. Also, see: porn industry.