I just realized as I was posting this that there is a model for this but I trained this one on 3 variations so I still think it has merit. The variations are just the tips touching(penikiss), shafts crossed(swordfight), and shaft touching shaft(shaft2shaft). Real simple tagging here.

Example Prompt:

frottage, 2girls, futanari, dark_skin, penikiss, sitting, blush, gloves, wet_clothes, wet_shirt, white_gloves, ponytail, small_breasts,

FYI as per usual this dataset contains zero men so if it works for men, great but I'm not testing for it.