So I've found SD is excellent for 'solo' / 'pinup' / 'softcore' / 'portrait' / 'sfw non-interactive' type shots out of the box, and pretty darned good for 'hardcore' / 'nsfw' / 'smut' also depending on what model you use, how you prompt, whether you use ControlNet, and whether you're an noob / idiot like me, or a seasoned pro. It also helps if you don't mind going through a ton of stray appendages, misshapen body parts, and 'nightmare fuel' glitches aplenty before you get it right on the 50th tweak to your settings :P

What SD is not so good at ? Kisses. The simple romantic gesture / interraction which involves the intersection of two human photgraphic subjects, overlapping facedata, and a mass of confusion for the algos no doubt, no matter what model, sampler and combination of settings you use.

So much like 'Legshow', here's a Lora / Dreambooth to try to solve this perceived problem.

Trained on a small set of 42 photos for v1. We've got a mixture of 100% sfw and some nsfw in the training data (so I've found bare boobies and/or chests creep in depending on strength and prompts), we've got boy-girl and girl-girl (although it seems to work for boy-boy too as you'll see in one of the sample images I generated once trained) and I've even included a small 'easter egg' with a completely NSFW variation (haven't tested that but the rest works so I'm sure it will too) for a few training shots too.

The 'magic woid' is "properkissing". "French" may work as a modifier, so may "with tongues out". Strengths are really random from what I can tell, based on a combination of model, subjects, other embedding or LORAs, the will of the gods ... who knows :-D

Let me know how you go, and please DO share your outputs as I love to see 'em !