How much fun would it be if you had a surprise element (just like real life) as to when you woo hoo you find out your sim is pregnant. Of course this would be harder to achieve than try for baby...but couples that want a family will try for a baby. Maybe a sim who is not fond of children would woo hoo and find they are pregnant. This would be an awesome addition. Maybe if not too offensive you could even give up the sim baby for adoption or pass it on to a family member to raise.