Correlated, because time spent apart causes infidelity for both. Also, cultural norms make a difference, and both are exposed to the same culture.
Anti-correlated, because differences in libido causes a higher probability of infidelity on the part of whoever wants more sex, and a lower probability on the part of whoever wants less.
I’m not sure which of these I find more convincing.
Correlated, because time spent apart causes infidelity for both. Also, cultural norms make a difference, and both are exposed to the same culture.
Anti-correlated, because differences in libido causes a higher probability of infidelity on the part of whoever wants more sex, and a lower probability on the part of whoever wants less.
I’m not sure which of these I find more convincing.