Fingernails (and sometimes toenails) are visibly manicured with nail polish, often in bold colors that pop in close-ups. It usually shows up in hand-focused moments like stroking a dick, fingering a pussy, or gripping ass and hips during fucking, where the glossy polish sells a more put-together, glam vibe. Artists may also use it as a quick visual cue for femininity or style even in otherwise rough, messy sex.