should have sex when your most able =3
when the guy's hormones are the most raging
and when the girls are best able to recover from a pregnancy ^_^
oh and also while the girl's vaginal fluids are still alkaline >.>''
sperms doesn't do well with low pH levels >.>''
incidentally, woman tend to become more acidic with age....
i think after 18-20 or something like that....
well you only live once =3
haha