This is true. I remember I was the one pushing for sex prior to six weeks, while my husband was worried about hurting me.
So yes, outside the context of coercion and abuse, it can be normal (if unusual, and probably medically inadvisible) to have sex after two or three weeks, and people who don't know Poet's dynamic with her husband might minimise the situation if they're one of those people who wanted sex earlier.
But regardless of when he's grooming, coercing, or forcing her into sexual activity when she's not enthusiastically consenting, it's all rape. Some of it might seem more unfeeling and morally abhorrent (such as when your wife has just given birth) but ultimately rape is rape, whether she's pregnant, post natal, or just on a random Friday night.
Also, I think it's worth mentioning that a man who treated 'The Game' as a dating bible is unlikely to ever view his wife through any kind of empathetic lens, as an equal human being. He values Poet as a service object for what she does to make him happy, particularly sexually, and not who she is as a person – which is why he can't manage to put her needs and wants ahead of his own wants for more than a couple of weeks. In his mind, he's the only real 'person' in the marriage, so only his feelings and desires matter.
I think if Poet read 'The Game' she might gain a new perspective on just how little her husband truly cares for her.