Pictures depicting vaginal penetration, whether by fingering, sex toys, tentacles, etc.
If, and only if, a penis is doing the penetrating, the image should also be tagged sex.
Note: Do not confuse this tag with vagina/pussy tag, which refers to female genitalia. If the character's vagina is clearly seen, it should be tagged with pussy.
The following tags are aliased to this tag:
vaginal_penetration and vaginal_sex
The following tags implicate this tag:
multiple_vaginal and vaginal_object_insertion