Implicating slit_sex → docking
Link to implication

Reason:

If Slit_sex is being used, it typically implies that both characters have a penis, with one entering the slit of the other, which is nearly identical to docking a foreskin or sheath since they're all designed to protect or hide the penis when not aroused.

EDIT: The tag implication slit_penetration -> docking (forum #240363) has been rejected by @NotMeNotYou.

Um... for starters, you just suggested an implication to a tag that may be aliased away. If the alias goes through, all of slit_sex tags will go away into slit_penetration and all attempts to tag slit sex will be corrected to slit penetration.

Secondly, -1, on account that docking is either with sheathes or foreskins (unless we agree to loosen the term); and -1 if slit_penetration is used because you don't necessarily penetrate with just penes, you can penetrate with objects as well.

Siral_Exan said:
Um... for starters, you just suggested an implication to a tag that may be aliased away. If the alias goes through, all of slit_sex tags will go away into slit_penetration and all attempts to tag slit sex will be corrected to slit penetration.

Secondly, -1, on account that docking is either with sheathes or foreskins (unless we agree to loosen the term); and -1 if slit_penetration is used because you don't necessarily penetrate with just penes, you can penetrate with objects as well.

As it stands, it has not gone through, with slit_sex still being a valid tag. But I specifically said to implicate slit sex, and not slit penetration.
however, an update to the wiki clearly indicates the difference between docking and slit sex, so I do rescind my suggestion

The tag implication slit_penetration -> docking (forum #240363) has been rejected by @NotMeNotYou.