> The median age of female's first marriage was less than 22 for 100 years and rose to 28 in the last few decades[1]. I would assume this results in a higher number of partners and more opportunities for an STD to spread.

This is a common talking point among conservatives, but it's off-base. Not only has the median number of lifetime sexual partners not increased (in fact, it mostly flatlined from the 1960s, and even fell for many demographics after the 1980s), but it's irrelevant to the issue of gonorrhea, because single unmarried women in their 20s are not the main demographic affected by gonorrhea today.