Can I "smell" an std? Is a foul smell an indication of it? Any more indicators?

Not really. Stds are tough to spot. That's why it's wise to use protection if you are concerned. At times, vaginal odor may be a female condition called bacterial vaginosis. That's not an std. Trichomonis is an std that infects the vagina (women) and urethra of men. In women, it may also cause a vag odor. Herpes, chlamydia, gonorrhea and other stds are not related to an odor. Be safe.