The Incredible Melting Man (1977)

In that same scene you see the man come over to the woman and tell her to take her top off for the shoot, she denies it and eventually they begin contemplating her taking her top off, eventually the man has a couple of attempts of reaching in and grabbing her top and pulling it off, which eventually does happen and you see her breasts for 4-5 seconds at the most, then after the camera pans to the hand the camera pans back to the topless woman for another 6-7 seconds( the camera does a lot of panning therefore the topless scene isn't as brief).