The tag implication #12515 mutual_handjob -> mutual_masturbation has been approved.
(UPDATED implication link above. Implication (mutual_handjob -> mutual_masturbation) OLD link was:
Link to implication )

Reason:

Similar to mutual_footjob which implies to mutual_masturbation. ( forum #189968 )

Also, there is plain mutual tag with 20 posts, but NO wiki (ie. not defined).

To see what we're working with, here are the current mutual* tags (ALL type general):

20 mutual
8 mutual_anal
1 mutual_appreciation
5 mutual_breastfeeding
6 mutual_fellatio
23 mutual_fingering
48 mutual_footjob , wiki: mutual_footjob
87 mutual_handjob
20 mutual_knotting , wiki mutual_knotting
1 mutual_mastrubation (TYPO)
659 mutual_masturbation , wiki mutual_masturbation
8 mutual_oral
2 mutual_orgasm
76 mutual_penetration , wiki mutual_penetration
27 mutual_rimming
1 mutual_tailsex
2 mutual_titfuck
1 mutual_tying

imply the mutual sex tags to mutual_sex ?
imply: mutual_fellatio -> mutual_oral ?

(since only one post tagged with mutual_tying, maybe manually change to mutual_knotting,
if new posts get tagged with mutual_tying ... maybe then add alias?)

(mutual* related: suggested alias of tongues_in_cheeks -> mutual_rimming at forum #261132 )

(semi-inspired by forum topic Unifying Penetration: All Tags, Wiki Update, Aliases, Implications

-1
Still standing by my earlier statement: mutual_masturbation should be disambiguated or even invalidated, since the name makes users mistag masturbation.

Just search for mutual_masturbation masturbation, most of which shouldn't be tagged as masturbation. And it's already been cleaned about a year ago, so those are new mistags.

See also forum #181501.