Why do most chats end up being about sex

Most women who goes online on dating sites are truly just looking for someone to love and who can love them back, but it seems for most men it's about sex and games. Guys a woman or most of them just need a man who is able to communicate in an affectionate manner, using the right words and see what happens. It's amazing what effect just the right words can have on a woman. Please stop with the dirty talk!