>>11357604
You sure there aren't any doujin with creative terms you could borrow? Anyway, taking inspiration from 'bussy' there could be 'dussy' (dick + pussy). Or otherwise could just use japanese romanji like some other fetishes (oyakadon, bukkake etc), so like 'dansei nyodo' (男性尿道, male+urethra) or 'inkei nyodo' (陰茎尿道, penis+urethra) or something, then just compact it into one word
Aside from that for a site like exhentai with gendered tags it's generally pretty obvious (except if it's like futa x women, then the 'female:urethra insertion' could apply to either)