Mycoplasma Genitalium is a pretty common autoimmune sexually transmitted disease, but there are not enough scientific researches and people are pretty much not informed and not aware that it even exist.
Also, there are very little or no visible signs, so many infected people don’t even know that they are infected.
It can cause irregular vaginal bleeding, painful sex, infertility, and ectopic pregnancy in women, while the effects in men are milder but can still be manifested through pain in the testicles or discharge from the penis.
One research in America from 2007, shows that this infection has outrun gonorrhea by the number of cases, and is now the third most common sexually transmitted condition among young people.
4.2 % of the adolescents that participated in this study were infected with chlamydia, 2.3% with Trichomonas, 1% with Mycoplasma and 0.4% with gonorrhea. Similar results came from the UK too, and it seems that it does not affect only the young people, but the middle-aged as well.
The best way to protect yourself is to use a condom. It doesn’t matter if you practice anal, oral or penetrative sex, in this way you are going to protect yourself from other STIs as well.