The act of a woman sitting cowgirl on a man having sex while the man is sitting on a toilet taking a dump and, at the same time, the woman is taking a dump through the triangle opening created by the man sitting on the toilet seat.
Linda walked in on Benjamin taking a dump and decided to take a dump herself and created the Bermuda Triangle
When three persons are engaging in sexual intercourse while each person simultaneously using means of oral and or genital stimulation for both other partners in the group. The equal participation on behalf of each person in the group forms a gang bang in the shape of a triangle
Dude, did you see those three guys in the back of that VW golf? They were all blowing each other, it was like a Bermuda Triangle of sex!