What does it mean when a much older lady gives you side boob?

Asked by XD (1524) November 18th, 2011 from iPhone

I’m rehearsing for a show that requires physical contact between me and another actor who’s a good bit older (in her 60s I think). She keeps pushing the side of her boob into my arm, and even went as far tonight as to hug my arm against her chest (as part of the action).

I know she likes me well enough—we’re friendly in all other respects—and maybe she’s a little sweet on me, I don’t know. (She’s also married.) I’m not interested or anything, but I’d like to understand what that kind of gesture might mean in this context. It just seems a little goofy, and other than trying hard not to move toward her boob or away from her boob in any measureable, noticeable way, I’m not really sure how to respond.