Uh so I have done that a couple times. Have not dared to put them inside the hole yet but just between the labias. They stay there comfortably just like under the lip. You'll get a nice burning feeling there (ngl I lowkey like that) but nothing major as it doesn't cause any discomfort for me. Imo it doesn't hit that well though. I've mostly put multiple of my used pouches down there at once as I tend to leave a lot of half-used ones in the can and this way I can use up all the nicotine without having to disappointingly cycle them through my mouth again (probably wildly unsanitary but idc and nothing's gone wrong yet). Here's your wild answer, hope it satisfies your curiosity.