I'm not in the descriptive review program myself but I know about it. Hopefully someone who IS in the program and is more of an expert will come along and explain it better than I can.

Descriptive reviews (which are also called "push assignments") are assigned to reviewers who fall under a number of categories: high quality reviews, timely assignments, etc. You can be contacted by an administrator, asking if you want to join the program, or you can request to become a descriptive reviewer by e-mailing (I believe) partners@edenfantasys. com. Descriptive reviews are different than regular reviews in that they contain only (or mostly) the facts. You get an item that hasn't been reviewed before and you do a review on the features of the toy, etc. without, say, giving it a four instead of a five because it was too big for you (since you're not reviewing for yourself but for everyone). I think you can add opinions, so long as they're only in the "Experience" and "Personal Comments" sections. Descriptive reviews are the reviews that are displayed directly on the product page. They're very important and that is why only certain people are allowed to do them. You can get them at any time and they don't affect your monthly free assignment schedule.

A push assignment is when, instead of you requesting to review an item, Eden requests you to do it, usually because a manufacturer wants reviews on their items. You'll get an email saying you have an assignment, and you can click through and look at it before deciding whether to accept or not. You can reject the assignment (maybe the product is a cock ring, and you're a single girl; there are ingredients you're allergic to; you just think it's ugly and don't want to do it) and they'll just pick someone else. Saying no doesn't make you less likely to be chosen in the future, and you don't have to say why.

I think anyone who is a regular reviewer is eligible, but I don't know how they decide who to push to. I just got my first push assignment this month, and I think I started reviewing here in September 2011.

Edit: After looking at Nazaress's post, this looks confusing. A push assignment can be a Descriptive Review, but it might just be a regular review. It's regular reviews that can just randomly appear in your mailbox one day. I'm not in the Descriptive Review program, but I got a Push Assignment this month.