How many heirs do you get in Shogun?

I always seem to max out at about 4 heirs after my original Daimyo. I nearly ran out once as the Hojo Horde surfaced in a game I was playing, and as they proved a tough nut to crack, my last Daimyo was 75 before I won the game.

Is there a way of getting your Daimyo a bit more randy, like making him stay at home with his missus/concubine?


------------------
Above all things, to thine own-self be true.