Hi, Welcome and thanks for posting your query to HCM. As per your query there were two episodes unsafe sex. Within 7 days period of unsafe sex presenting as foul smelling discharge makes the possibility of Trichomoniasis and not yeast infection. Trichomoniasis caused by parasite n known as Trichomonas vaginalis. It is mainly Symptomatic in females where itching or burning sensation in vagina or internally and pain in intercourse and urination are the common symptoms. But the hallmark of this problem is yellow-green, itchy, frothy, foul-smelling ( we call it typically fishy smell) discharge from vagina within 5 to 28 days of exposure. Men are typically asymptomatic. Possibility of candidiasis or yeast infection is less as it do not present as foul smelling colored discharge but rather presents as curdy white discharge witch is not foul smelling. For the treatment part you can take Tinidazole 2 g or Secnidazole 2 g or alternatively metronidazole 2 g as single dose. The last one sometimes cause bad taste so preference to first two. Last point of suggestion – Always use condoms as best part of protection in future. With best health wishes, Dr Sanjay K Kanodia MD ( Dermatology and STD/ Venereology)