There are a few references to casual sex in the conversations, including one fleeting reference to two women sleeping together...the latter however is not a serious suggestion but part of banter.
At one point there is an ice sculpture of a nude man and clear innuendo referring to a certain part of his anatomy and the state it is in, which is seen and discussed by the women in the room, but (as far as I recall) no frontal nudity is shown by the camera which shows only (albeit very clearly) the side view of a bare buttock of the sculpture.
There are instances of a man and a woman (who are to be married) kissing.
There are derogatory comments by the mother of the bride about the relative sizes of two of the bridesmaids' busts.
Female dress is on the whole quite modest by modern standards; one character in particular does wear a more revealing top but I think more as a consequence of having a fuller bust than in order to deliberately flaunt herself!