Manjula acted the most sexy scene of that period in the movie Marupiravi with Muthuraman. In this movie, she comes in a nightie and get into bed with muthuraman and has sex. There are some deep cleavage shows and muthuraman removes her nighty and unhooks her bra.
There is also a bathing scene where Manjula undresses herself . There is also a very erotic scene where Manjula removes her towel and shows herself nude to Muthuraman. Those days, in black and white , so much sex and exposure was new to tamil cinema.
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Manjula in Marupiravi link