Dr. Adedayo A answered:
a year ago
HELLO SIR,the womna can still catch the infection at anytime in her cycle.the reason why its suggested you have UNPROTECTED SEX only during her ovulation is to reduce her overall chance of catching it.imaging having unprotected sex every other day for a month as against only on her ovulation day.thats why I said on other days,you use a condom. Secondly the man has to have blood tests once every month to check his viral load. Once he has had 6 consecutive months of low viral load,then the couple can start having unprotected sex during her ovulation period.
TO futher reduce the transmission chance,some practioners will out the partner on Post exposure prophylaxis.