The BJ parts look kinda weird, i think the reason of that is because the ai is drawing the mouth part too on the face and thus we get the uncanny valley effect.
For the intercourse, the vagina looks very fake. LTX model is multimodal and includes just 22B param so we can assume only a small number of actual vaginal pictures were used for training hence we get those results. I dont think changing the parameters would do much, either need to fine tune the model or try some different model which focuses on porn. It looks like this model can work for penises sure, but probably not vagina.