Many women in western culture will emphasize cleavage to enhance femininity. They may do so by means of the cut of the outer wear, and by brassieres (bras) that push the breasts upwards and together. Special pads and inserts in the bra can also be used to aid in the positioning of the breasts higher.
It is a stereotype that homosexual men tend to be very effeminate, although this is not always the case. Drag culture, often associated with homosexuality, makes a virtue of male femininity.
Source: Wikipedia > Femininity
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