text: If the woman's infection is in her throat, then it can me transmissible via fellatio, but this is rare because chlamydia has a moderately-sized infectious dose. A certain minimum of bacteria have to move from the throat to the urethra. Biologically, men do have less ability to pick up infection as insertive partners compared to women who receive (into the pharynx or into the vagina).\n\nSo it's difficult for this to happen, but not negligible. Always use a flavored condom during fellatio.