Penetration
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
In criminal law. In rape and some other sexual crimes, actual carnal knowledge is requisite, but the slightest penetration is sufficient (102 N. Y. 234), it being enough if any part of the virile member be within the labia of the pudendum (1 Car. & K. 393). Rupture of the hymeneal membrane is not requisite, though, in the absence of such rupture, proof of penetration should be clear.
8 Car. & P. 641.