Yeah, if you say "I want sex and nothing else," that will be attractive to a certain sort of woman looking for a certain kind of interaction. But it is not likely to end up in a serious relationship. And if you say "I am not looking for friendship with any girl" then you are calling yourself a prick, IMO." I am romantically interested in you" is straightforward and fine, but to say that you only see women as potential sex-mates, never friends...well, you might as well introduce yourself by saying, "Hi, I am a prick."