In before "Look at the last names" and "This is an interesting (((study)))".
But seriously. For reference,
here is a copy of a version of the SAST. As you can see, the score will be almost entirely dependent on the subject's view of sex. A deeply religious guy who got a hand job once may be classed as a sex addict, while a guy raised by hippie bohemians in SF who regularly engages in anonymous, Eyes Wide Shut orgies is not classed a sex addict.
To the social anxiety aspect. I don't know. I'm going to put aside anything I have studied or read and base this solely on my recent, extensive foray in to online dating. I met a mix of girls. I would say it was pretty 80/20. 20% were so "social" that they would come straight to my hotel room. The remaining 80% were definitely awkward. I mentioned this in my original data sheet, but I didn't really explain. I was noticing a lot of silence, inability to maintain eye contact, and general reticence.
But let's be honest. The younger (plugged in) generations seem to exhibit a lot of this behavior. Go in to a Best Buy and try to maintain a normal conversation with some of the spergy blueshirts. It is difficult, to say the least.
Finally. Sample size = 279.