This happened to me on holiday last month.
A couple of days before I went away I went and bought new bras because the ones I had were too big in the back. So I went down a back size and up a cup size. I didn't try them on until the next day, when I found out they were too small in the cup now (and I was astonished at what size I must actually be). But I was going on holiday the day after and so couldn't take them back, so I ended up having to take them with me anyway.
It was around 90 degrees on holiday so I was wearing vest tops - some of them v-neck type, some of them normal. Well when I wore the bras they gave an amazing cleavage because of the small cup. So everywhere I went my chest was getting stared at. At first it annoyed me a bit, because I wasn't used to that kind of thing. But in the end I ended up getting turned on by it because of that 'you can look but can't touch' feeling. I would eventually bend over in front of someone on purpose etc, but most were just happy to catch a glance when I was walking down the street. Sometimes I'd go back to the hotel and head straight for the bathroom to play with myself when my friend was in the main bedroom.
I think I made quite a few hundred men happy on that holiday.