Is it inappropriate for a mother to wear a bikini in front of her sons and their friends?

OK I'm asking this for a friend, she's in her early 40s and has two teenage sons (one 15 one 17) and she still has a great body. Actually a bit like Courtney Cox in that show ( cougar town or sth). Anyways she and her family and two friends of her sons go on vacation to Miami and she was wondering if it was inappropriate for her to walk around in bikini.

What do you guys think?
Is it inappropriate for a mother to wear a bikini in front of her sons and their friends?
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