I know several like that too. I think there's a decent chunk of younger people who come from Catholic familes, still consider themselves Catholic as a result, but don't really adhere to a lot of the orthodoxy, especially on contraception.
The Catholic church would probably not accept them as true Catholics, and most of the ones I know who fit that bill never go to Mass (or church in general) etc. But they still self identify as Catholic as how they're raised.
How large a subset of people that is, I don't know. But it's clear that there's a large chunk of Catholics who don't care a ton about contraception, abortion etc. given exit polls showed Romney and Obama pretty much splitting Catholics (was 50-48 in favor of Obama--http://www.cnn.com/election/2012/results/race/president?hpt=hp_c2#exit-polls). Those issues clearly aren't a driving factor for Catholics if half of them voted for Obama.
The contraceptives thing is a thing a majority of Catholics have long discarded though. I just pulled up a scholarly journal article that showed the following rates of using contraceptives among Catholics over time:
1965: 57%
1973: 67%
1982: 73%
1988: 75%
For protestants the trend was:
1965: 66%
1973: 72%
1982: 70%
1988: 77%
Article here though you probaby can't get the full text if not on campus network:
http://www.jstor.org/stable/10.2307/1966780.
Anyway, as much as Catholic leaders made noise about contraception coverage in insurance, it's pretty much a dead part of their orthodoxy in the US in terms of their followers actually practicing what they preach.