The majority of MLs just give you the standard massage and HJ - or nude HJ for a bit of extra cash.
A minority of MLs will offer FS or a blow job or let you DATY them; but it's not because they like you or you are special - they just want to make some extra money.
Having said that if you are a bit of a sweet talker and polite and not ugly, you are more likely to be offered FS that a rude, ugly bastard.
MLs can choose if, when and with who to have sex.
Some who are desperate for money will offer it to anyone, but those who just want to earn some extra cash will pick and choose who they offer it to. So if you are not totally disgusting there is a chance you will be offered it.
One thing you can be sure of is that you are definitely not the only one being offered it.
Never fall for the line that you are special and the only one offered it - don't be so naïve.
Personally if I want a fuck or a blow job I'm not gonna leave it to chance - I'll go to a FS shop where its a sure thing.
If on the other hand I want just a relaxing massage and HJ then I'll go to a R&T shop - and I am usually feeling so relaxed and lazy that even if extras are offered I refuse them. Although if the girl is super hot and she pushes the right buttons I'll take her up on the offer.
Just to put things in perspective I get offered extras only around 1 out of 10 visits.
Then again I never ask for them.
And I am an ugly bastard.