In an episode from Season 5, Booth and Brennan wander in the forest to find a group of women as witches, who are in the middle of the Waning Moon ceremony in front of the fire. Eventually, The women all take off their robes, much to the surprise of Booth.
In one episode of Season 6, Daisy and Sweets were having sex on a couch naked only to be discovered by Booth and Brennan, much to the embarrassment of Sweets.
This show contains a fair amount of sexual references, both verbal as well as occasionally visual. Two of the characters are involved intimately through at least a season, and are occasionally shown thrashing about under the sheets. One of the characters speaks freely and frequently of her sex life. Nearly every episode has some sort of sexual situation or comment.
Main character has no problem with casual sexual relationships without emotional attachment (very few incidents throughout the seasons). She also speaks freely of sex, body parts, and other sexual things that may be offensive.
An episode depicts a scene involving two characters (a man and a woman) entering a strip club where the man is given a lap dance where he is uncomfortable yet the woman appears to be quite aroused and entertained. Many woman are seen in Bars and skimpy outfits.