While I almost never tip, there has been a few instances when I think about it now that I have given some extra dough.

Girls who drive far to see me and who insist that their rate is what it is (i.e. they don't charge extra for travel) and who have discounted multi hour dates per the website are people I consider tipping.

Yesterday, as we had a huge storm in NYC, a girl made a Herculean effort to come see me but we decided on her way to me to reschedule for safety reasons. Had she made it to my outcall, I cerainly would have given her something extra for the effort and aggravation for all the extra time she would have put in fighting traffic and horrific conditions.

...by reputable independent providers. Providers with reputable agencies don't expect tips either. Whether you tip or not is up to you. But a provider that lets it be known a tip is expected or required should be avoided.  

Some make the argument for tipping agency providers because part of the payment goes to the agency. That's your call. If they were independent they would have overheard.

If you do tip it comes at the end of the session.

I'm the guy who goes to the extreme you take care of me I will repay the deed 10 fold.

I tip in different ways than most
Room Service for a girl who looks like she needed a meal.
Donation to a UNICEF fund in the womens name
Used video game
Animal Food
American Girl Doll
Money Ranging from 20 to 200 depending on what was in my pocket
Countless Gift Cards  
Cornish Game hens for someone who told me that's what they wanted most out of life.
A picture of us in a locket and a teddy bear. No I love you were shared for those who want to joke.  

I didn't have extra money in my pocket to tip the girl I saw earlier this week. I gave her a Hershey Kiss which was oversized and a lottery ticket. When I see her again I will bring something nicer.

Take care of others. Never come empty handed. Rules of my mother and sister

it is greatly appreciated when I receive them.
Most independent providers I know do not expect to a tip.
If you are going to a massage parlor and the lady provided excellent service or went over and beyond a tip would be nice.
The best tip is a return visit

Tips

I suppose a tip is a personal choice, and I get them about 50-60% of the time. I have one particular person that from the beginning, he has always given double my hourly rate. On the 8th time of seeing me last week he mentioned the reason he tips so much is because he wanted to treat someone that he really likes extra special. That way, I'd be more likely to accommodate his odd days or times and clear my schedule. He is absolutely right, it worked like a charm. If you really like the provider and imagine seeing her again and again, I'd say tip. She is more likely to give you extra special priority. Just my opinion.

Is it wrong to ask....

...for tips?

In many MPs, the initial 40-60-80 fee is the house fee and that gets you very basic service, e.g., shower and light massage and MAYBE a HE.  

You then have to pick up on signals from your masseuse and figure out or negotiate for additional services. Those tips for extra services are definitely expected / required at that kind of MP.  You can call it a tip.  You can call it a modified fee. But, yes, by the time you are at the level of a full service non-GFE MP, you should be in the same range as the Prix Fixe MPs or even similar independents.  

If you are asking about tipping the Prix Fixe escorts, then that's commonly answered elsewhere, as well. "Tipping is not required but always appreciated," is commonly advertised. Remember that agency girls are splitting the fee but indies keep it all. Remember that the indies also have expenses not covered by an agency

buy them a gift.

 I tipped escorts in the past and only once out of about 5 times did they even thank me for the tip.

 I guess they thought they deserved it???