[gidget7]

Yet, curiously, although infections can happen with heterosexual anal sex, AID does not.

[M. Dodge Thomas]

Yet, curiously, although infections can happen with heterosexual anal sex, AID does not

If I understand you correctly, this is not the case: there is no evidence that the mode of infection affects the progress to AIDS once someone is HIV positive, or that other factors being equal anal sex is a less efficient mode of transmission from men to women than from men to men.