Does endometriosis smell?

No. To the best of my knowledge there is no particuar odor associated with endometriosis.
No evidence for this. Change in odor is not one of the reported symptoms of endometriosis, those being problems with pain and infertility. Even when operating inside a pelvis full of endometriosis I have never noted any different odor. If the patient notices any foul or fishy smell it is much more likely due to a vaginal infection.