True, but not quite applicable. In the case of an MSM, the epidemiological chain begins when he has sex with an MSM. In the case of a woman, the epidemiological chain begins when she has sex with an MSM.

The criteria for joining those excluded groups are identically rigorous, and yet the rules for each are quite different.

There could be a difference, if on average, out of the population of people who have been with a MSM at least once, men on average have been with more MSM than women. The populations of exclusive MSM, and MSM who also sleep with women, may have different levels of risk.