First of all, keep in mind that you pushing the limits like that is fine. A lot of PUAs especially new guys to the community are going to freak out when they hear stuff like that cause they are sensitive to value shifts and stuff. I have gone extremely sexual early into the conversation with girls and I'm an advocate for it especially if you're looking for a single night lay.
Some of the stuff I've said to girls in the field would make your comment look pretty tame! IF you have the balls and moxy to pull it off go for it. As you said girls are socially gonna freak out at times cause of society but you have any doubt a girl isn't as sexual as you are read My Secret Garden by Nancy Friday. It gives a good insight into a woman's fantasy's.
Anyways, I've asked girls their favorite position and when they tell me 69 I've said its cause they love the feeling of balls slapping against them and stuff like that. I've told women I'd be fucking them in their car later in the night, and done it. I get pretty graphic at times to sexual things.
Congrats for pushing your limits and you'll be amazed at just HOW MUCH girls will let you get away with saying.