...I've managed to get some whitelists anyway.

The best way to get whitelisted is to show up clean and on time, be a gentleman and don't overstay your welcome.

Some providers have a policy of not whitelisting you until you've seen them several times to make sure your first visit was not an anomaly but that's not a hard and fast rule with most providers.

Do you have to do a review? Can an agency you have been working with do it or only the girl

Not all providers whitelist but if you are a good client and you simply ask her, many will be happy to whitelist you.

However, you are not obligated to do a review.  Unless the agency has a profile on here, I don't think it can give you a WL referral.  Usually, even agency girls will have their own profile here, so they would be the one to give you the ref.

So asking is a simplest way for him to remedy his problem if he does the other things you recommend.

I usually show up clean and on time, and act like gentleman every where I go. I usually don't get my dick sucked. With out having to ask, at least once.  

but BPS is correct, Swim said "you have to ask" and that simply is not true, anymore than telling a provider that she has to "ask" to get reviewed.

It can be helpful to ask, but it's hardly a necessity to do so. I do agree with what you said about asking possibly being the "easiest" way to get whitelists, but that's not what Swim said.

FWIW, I don't think whitelists are really very important, nowhere near as important as reviews are to the ladies.

Swim was correct when he said that writing reviews is not necessary to get whitelisted, BPS and I both have more whitelists than reviews, truth be told I have zero reviews, but have still managed to get whitelisted, so it can be done.

Hmmmm..