"... I see." Fayruz sighs. "How to say this delicately... No, it's a lost cause. If the man refrains from planting his seed within the woman, and takes care to spend himself elsewhere through other methods, the chance of a child is low. It is best not to... even go to the planting ground, so to speak... but even so long as one retreats from it, it is possible to have sex without guaranteeing a child."
*The withdrawal method of contraception has about a 1 in 5 chance of resulting in a baby per year with typical use. In other words, it's 80% effective. If you don't use any method, you have a 4 in 5 chance of having a baby per year. In other words, shemtej practicing a similar level of abstinence to Osirian men will have roughly 1/4 the children per year due to their better background level of sexual education. Given that shemtej also culturally practice bisexuality and various alternate forms of sexual gratification than PIV sex, I think it's justifiable that they genuinely have less children than your typical Osirian.