Which condition typically presents with a thin, grey-white discharge?

Bacterial vaginosis is characterized by a thin, grey-white discharge that often has a fishy odor, particularly noticeable after sexual intercourse. This discharge results from an imbalance in the normal bacterial flora of the vagina, leading to an overgrowth of certain types of bacteria while reducing the beneficial lactobacilli.

The condition commonly presents without the intense itching or irritation that might be seen in other infections, such as vulvovaginal candidiasis, which typically results in a thick, white, cottage cheese-like discharge. Chlamydia infection may also cause a discharge, but it's usually more purulent and not typically described as thin and grey-white. Trichomoniasis is often associated with a frothy, yellow-green discharge and can also cause discomfort, which differs from the presentation seen in bacterial vaginosis. Thus, the distinct characteristics of the discharge in bacterial vaginosis support it being the correct choice.