As someone said, she admitted it on Howard Stern.  But, that doesn't necessarily make it true - what's said on Howard Stern is said for him and for the listeners and may not intersect with reality in any way.  Two other examples: Bree Olson said she does on Howard's show but it seems to be impossible to make a date with her; Lesley Zen said she never would but she does.  I could probably find more examples but I rarely believe anything said on Howard Stern about "escorting".  I consider it to be part of the act.

Having said that, my "go to" person for accurate answers is generally Adonia at TLC.  If Jenna provides, Adonia will know.

FWIW, I met Jenna at the Exxxotica expo in NJ in November.  She was very nice, good attitude, and when it came time for the picture, SHE suggested that I hold her breasts for the photo.  Believe me, they are very nice breasts to be holding.  I didn't ask her about escorting though... mostly because she was standing right next to Brooke Haven who I had already asked, and I thought it might seem tacky to hit on two women next to each other like that.  What can I say, i have *some* manners.