I like the idea but my first impression is that the front page is a tad overwhelming. I didn't actually read the top green pane until after looking at the images, which may say something about how users look at the content.
Perhaps interestingly, my first click was to Browse Top Lists, only to find that Porn Actresses, Page 3 Models and Hentai artists all feature in the top 5 and 4/9 trending lists have the same pink handbag image, even for the Best Web Apps list. You need an adult category which you can hide the NSFW lists in and then not display this to logged out users. As already noted, I think the content is your biggest problem; I may not be your target audience but regardless there's little there to be encouraged to comment on or find inspiration from for new lists.
Perhaps interestingly, my first click was to Browse Top Lists, only to find that Porn Actresses, Page 3 Models and Hentai artists all feature in the top 5 and 4/9 trending lists have the same pink handbag image, even for the Best Web Apps list. You need an adult category which you can hide the NSFW lists in and then not display this to logged out users. As already noted, I think the content is your biggest problem; I may not be your target audience but regardless there's little there to be encouraged to comment on or find inspiration from for new lists.