I've seen a decent amount of pictures featuring orgasms where the subject receives stimulation that isn't induced from the subjects standard means of orgasm, these being either genital, anal, or nipples. I suggest a standard tag be nonstandard orgasm.
Some posts featuring such tags:
https://e621.net/post/show/1253504/anthro-anus-avian-badquinque-beak-beakjob-bird-bow
https://e621.net/post/show/1236417/anthro-anthro_on_feral-balls-bestiality-blush-cum-
https://e621.net/post/show/767609/ambiguous_gender-anthro-anthro_on_feral-bestiality
https://e621.net/post/show/720452/2015-animated-anthro-anthro_on_feral-bestiality-br
https://e621.net/post/show/1253705/2017-4_toes-animal_genitalia-anthro-armpit_hair-ba
https://e621.net/post/show/1208988/2015-animal_genitalia-animal_penis-anthro-anus-blu
https://e621.net/post/show/1157467/2016-anthro-balls-barefoot-bdsm-black_fur-blindfol
https://e621.net/post/show/1146292/animal_genitalia-anthro-arms_tie-balls-blindfold-c
https://e621.net/post/show/965688/accidental_incest-after_orgasm-age_difference-anth
Updated by BlueDingo