We bd on Saturday when the OPK was positive, after that it dropped again. Ended up being in a girl position, on ovulation... so we'll see what happens.
For the girls, apparently lots of sex, before you ovulate (So the faster, boy sperm die off before the egg drops).... we have 1 son, and only had sex once the entire month, we weren't ttc him, but not preventing at that point. The girls, lots of sex held true for us