Your doing a public service by letting him look down your top though, it was part of a study that a couple minutes a day perving can increase a mans life span by as much as 10 years. Its true, i saw it on the internet.
Also, females void any comment about male perving if she wears:
tight jeans
tube top
no top
short shorts
basically any figure hugging piece of clothing, if you dont want people to ogle dont advertise it. Of course, don't let this put you off wearing those clothes though