... I see woman out on the street or on the train or what have you... women I do not know. I want to ask them (tactfully) if they'd be interested in having casual sex. But is there a way to even do that?
I have women friends I know that have told me if (some) of these women know I was 9" they would jump at the chance (which I find a little outlandish).
So is there a way to tactfully ask a woman to have casual sex if you think she is smokin' hot?
No, there is no polite or tactful way to ask. Most women, even if they were interested, would be insulted by the question (or would at least say "No") because to actually
say they want to have casual sex would mark them as sluts/whores/tramps/etc.
On the plus side, it is true that many women will be interested in having sex with a well-endowed man shortly after meeting him. Before my current girlfriend, I was at a nightclub with some casual acquaintances and some people I had never seen before. When I stood up, the woman seated next to me saw the bulge in my pants. She invited several of the people to her home after the club closed, knowing that everyone else would decline. She still expected me to make the first (actual) move, but when I did, her expression said she was thinking "Finally!".
My suggestion is to wear light-colored pants that are not tight, but drape well enough to show bulges (I lean towards khaki).
Some women will initiate conversation, but will need a reason. Maybe carry an interesting-looking book, magazine or accessory (not birds... every guy I've seen who's tried that was described as 'weird' by the women I spoke with).
If you notice her checking you out, but she is not saying anything to break the ice, you could say, "Hi. You look like you're interested in my <book/magazine/accessory>. Would you like to check it out?" or something similar. If it's a magazine and you see her on a regular basis (you both ride the same train), offer to let her borrow it for a day or so, so you'll both have reasons to talk to each other the next time you meet.
Also, don't make a production out of displaying your bulge. It will come across as a crude gesture which will make them think you are trolling for sluts. They may be willing to
be sluts with you, but they don't want to think of themselves as sluts or as one in a long line of conquests.
In whatever conversation you have with her, do not refer to your endowment at all. If she is checking it out, do not let her know you know she is doing that.