C. Koide et H. Seno, SEX-RATIO FEATURES OF 2-GROUP SIR MODEL FOR ASYMMETRIC TRANSMISSION OF HETEROSEXUAL DISEASE, Mathematical and computer modelling, 23(4), 1996, pp. 67-91
We consider the SIR model with two sexual groups to discuss the effect
of the asymmetricity in the transmission dynamics of STDs. It is show
n that the asymmetric transmission between two groups results in the a
symmetric structure of infective populations.