The intersection of thighs and abdomen is a common area that is often highlighted in sensual and erotic literature. However, if you are a writer looking for synonyms to describe this area without being too explicit, there are several options to consider. Some popular options include the crux of the hips, the pubic region, the pelvic junction, or the juncture of the lower abdomen and upper thighs. Other options include the groin, the crotch, or the junction where the legs meet the torso. Ultimately, the choice of synonym will depend on the tone and context of your writing, but these options provide a great starting point for tastefully describing this part of the body.