I think instead of online dating, single women should switch to on-water dating. Every forum I read is full of single male sailors looking for women who would be interested in sailing with them on weekends and maybe, just maybe taking off cruising with them on vacations if not longer.
Yes, yes, "the odds are good, but the goods are odd". This is true in any group of people but I admit that you are likely to need to weed through the group to find a diamond in the rough.
And yes, yes, it is a bad idea if the woman is not already outdoorsy and I'm definitely not suggesting faking interest in boating.
Still, as a favor to the single male sailors out there who are looking (and of course not all of them are), I suggest that the single women out there who lament the lack of unmarried men consider that there is a large pool of them in the sailing community.
Volunteer to crew at a local race and find out.