A subset of involuntary penetration where someone is in a position where they would normally control their penetration, but instead they're being forced to move to penetrate someone or something against their will. A male lying on his back doesn't count; the penetrating body part must be moving against its owners' will.

For a receiving partner, see forced to top or forced oral.

For a stationary or potentially willing penetrator (but still not in control), use involuntary penetration.