If a guy has a STD, he has a greater likelihood of transmitted to a girl in BBBJ. Likely from CIM or swallowing.
If a girl has STD (which is in her oropharyngeal region), the transmission rate to a guy during BBBJ is lower (than vice-versa).
BBFS / vaginal sex / anal sex is a different story all-together. Transmission rate is roughly equal both ways. But a bit higher from infected guy to uninfected girl.
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