swinging (sex)
A niche sex position that is very reminiscent of playing on a swing (hence the name of this ), or "teeter-tottering" on a seesaw.
When two tops are involved and they are smaller than the bottoming partner, this sex act leans much more towards the seesaw example where both of the tops grab hold of their receiver's body and use the weight of their hips to thrust into their anus and/or pussy. Usually involves a larger female as the bottom, but it is not impossible to do it with a larger male as the bottom.
When only one top is involved, this sex act can go one of two ways if they are smaller: the sole top performs the act on the bottoming partner, as described above, or does so by holding the other's head instead to face fuck them. If the penetrating parter is around the same size as or larger than the receiver, then the top instead makes the other do the swinging in reverse fashion.
Not to be confused with swinging or the slang term for consensual cuckolding.