I wonder is the condom is less effective.
Condoms have a 10 to 15% failure rate in preventing pregnancy in real world usage. (And if it fails 10% of the time in preventing pregnancy, and a woman can only get pregnant approx 7 days a month, but can get AIDS 31 days a month, the failure rate of condoms in preventing AIDS is that much higher, which is why it is malfeasance at best to recommend condoms to prevent AIDS.)
The typical use pregnancy rate among condom users varies depending on the population being studied, ranging from 10–18% per year.
So I was wrong. Failure rates average 10–18%, not 10-15%.