While I might agree that the personals themselves aren't Adult (though most of them certainly are not free like you're advertising on the site), the fact that you're including things like sex screensavers and the like (which, although they're coming from another site, are presented as though they are coming from yours) could well push the site over into Adult content. That's not discrimination but simple observation.
Oh, now wait a second, I see that you also submitted the site to the Adult section (and asked about it in the Adult section of this forum). If you don't think the site is Adult in nature, why did you submit it there?