From my anatomy class;
Y-xme(boy) is small and fast in swimming while X-xme(girl) is big,lazy and is believed to hold alot of information.The only fertile days in a female is + or -3 of the 14th day in every cycle.Therefore,ovulation happens only on the 14th day.Y-xme has a short lifespan of about 12 hours while X-xme has a lifespan of up to 72hrs meaning it can live in the vagina for 3days.
NB.You can only get a boy when there is an intercourse on the 14th day and a girl any other day in a period of 72hrs that is 11th,12th,13th and 15th,16th,17th.Beside counting the 14th day,signs like rise in body temp,increase in V-discharge can be noticed.The signs are ovulation day and very ideal for the Y-xme.
So,you can see why unplanned intercourse results to girls.Also,very important is the building of volume of males S....The average acceptable levels are 10ml.
MY 2 cents!!!
"You're not supposed to be so blind with patriotism that you can't face reality. Wrong is wrong, no matter who says it". Malcolm X