I've heard reports that one of the difficulties medieval peasants had was their poverty depressed their fertility; producing babies fast enough was difficult. Very under weight women do not ovulate (correct?), and I guess the diet and working conditions of peasants might reduce the likelihood of completing a pregnancy.
If so, our expectations of the probability of sex leading to pregnancy in Glorantha might be too high. Perhaps simply refraining from personal fertility magic might be a moderately effective 'contraceptive'.
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