Is this a funny joke?

A pretty young woman starts her first day at the front counter of a bakery store. A guy passing buy notices she's wearing a very short skirt and thong underwear. Thinking fast, he goes inside and asks for some raisin bread, which is on the top shelf. To get it, the woman has to climb up a ladder which gives the guy quite an eyeful. She's on her way back down when he says he's having company and could use a second loaf of raisin bread. Back up the ladder she goes, and another guy passing by decides he needs some bread too. Before long, a group of guys is in the bakery, all ordering raisin bread and enjoying the view. The woman is getting annoyed and tired from going up and down the ladder. Finally she's at the top, getting ready to step down again when she sees an old man staring up at her. Trying to save an extra trip, she asks the old man, "is yours raisin too?"

He replies, "No, but it's starting to twitch a little."