From OnlineDatingPost

Speaking of sharing, Twitpic Blocks Posterous’ Import Tool; Out Come The Lawyers. Data portability isn’t something discussed in the dating industry very often in public. Dating sites sell profiles up and down the river every day, but that’s a big shhhh! topic. Everywhere else, data portability is the topic of the moment, and will be for many quarters to come.

While I’m glad the message is getting through, without some standards like APML your not going to see any portability in the dating field. Even OKCupid.com who is one of the enlighten sites doesn’t have support for Openid, Oauth or anything like that. Supporting profile and data sharing or portability is going to be a major stumbling block for any dating site, simply because the revenue models rely upon data being held, locked down and processed by the company. This doesn’t fit with data portability right now.

Once they work out they can track people around the web using cookies and other techniques (which I assume will make there searches stronger and there for make for better matches) I’m sure you will start to see they at least providing openid if not oauth between partner sites.