I'd venture the opinion that there's a generation gap along the size of the Grand Canyon there: those of the boomer generation are largely of the "no chance in hell" persuasion, while the boomer generation's kids are largely of the "what's the big deal?" persuasion. Of course that's not absolute, but my sense is that it's a fairly reasonable rule of thumb.
Rule of thumb? More like the all-to-common smug and mistaken belief by those of one generation that their age cohort is more "hip" than the age cohorts which proceeded them. You and a few others here
really need to read the Kinsey reports from
1948 and
1953. Seriously.
The various practices you blithely assume are performed more often today were performed nearly as often then. The only difference is that people
talk about those practices more openly. Nothing more.
Edward's sexual needs weren't that outre even by the mores of the time; just check out the activities of a few of his brothers if you don't believe me. It was only because Edward's preferences were whispered about and not even discussed at the level of gossip, that they took on a more sinister cast. The secrecy surrounding the issue inflated what was basically a liking for fellatio and spanking to absurd proportions.
Returning the the actual topic, there are no "slam dunk" candidates for the role of Edward's bride. I think a good case could be made for hundreds of women who had a suitable background. I also don't think a foreign match is automatic.