Comfort is the most significant practical hurdle at 38 weeks. The physical size of the abdomen often necessitates creative adjustments. Traditional positions may become uncomfortable or even unsafe if they involve the person lying flat on their back for extended periods, which can compress the vena cava and reduce blood flow. Side-lying positions or positions where the pregnant partner is upright or on top are often recommended to alleviate pressure and ensure better control over depth and pace.

One of the primary reasons couples engage in sex at 38 weeks is the pervasive belief that it can jumpstart labor. This is where biology and folklore meet scientific scrutiny.