Penetration

1. The passage through a partition or wall of an equipment or enclosure by a wire, cable, or other conductive object.

2. [The] unauthorized act of bypassing the security mechanisms of a cryptographic system or AIS.

3. The passage of a radio frequency through a physical barrier, such as a partition, a wall, a building, or earth. Source: from Federal Standard 1037C and from MIL-STD-188 and from the National Information Systems Security Glossary

Sexual penetration:

• sexual intercourse
• fellatio
• anal sex
• sexual penetration with a finger or object