That's not true. Both can cause infertility in women. One of my friends is an ob/gyn and they say that one of the saddest parts of their jobs is telling a couple that the wife is infertile because of an STI she contracted (almost always Chlamydia or Gonorrhea) at some time in the past. Both of these STIs can go undetected in females for years. They just don't have any outward symptoms. By the time they find out, it is too late.
It's the detection that is the problem. Ideally people will get checked regularly, but with the state of healthcare in the USA, we know that does not happen.
