Gillian,
Dun think that way. I used to be angry when hubby is tired too. But slowly I understand that tiring feeling. Actually, if tired, the quality of the sperm oso no good.
Wat u can do is not make it look like a task to him. But rather "seduce" him will be a better way. BD in a romantic and relaxing way more easy to strike.
When both of us in a good mood, I'll explain to him how female body works. Like when we O, why we must try to BD during fertile period. And of cos, once a while tell him, if got bb how nice.
Now, he try to work hard. But sometimes it's me real tired that I juz bluff him today no nid. Tmr then ok. Cos when tired, can't enjoy much too.
Sorry huh, a bit naggy....