Last escort lovley her pussy was moist for the entire booking, was this lube or was she naturally moist?

Any ideas?

How old is she? 

Say 38 probably mid 40s.

If it was a younger girl i would have said it's natural. In that age it could be both. You should have given her a lick so you could find out what it is...  

I did lick, all seemed natural.

Then natural it is. I don't see anything odd there, everyone enjoys receiving oral.