Actually to give in context, it's actually quite interesting. Toxoplasma gondii is an interest parasite. You probably know about it because it's famous for spreading by changing the personality of rodents and makes them take more risks and makes them attracted to the smell of cat urine. (To help with their lifestyle). In humans it can also cause several personality disorders in some cases.
One thing researchers noticed though was that female rats preferred to mate with male rats that were infected. They did studies in humans and humans who were infected were perceived as better looking than those that weren't and had better facial symmetry. Men had higher testosterone levels and women had lower BMIs.
Pretty interesting actually beyond just making rats sexy. Fascinating parasite.
https://www.sciencealert.com/mind-a...nfected-people-more-attractive-study-suggests