"it is not unIslamic to have spaces between births (as in, not get pregnant, produce baby, get pregnant again). Surely, this is the best way forward, to engage the leaders in communities and to find alternatives that are more progressive, while being culturally acceptable?"
I may have this totally wrong, but I understood that Muslim women are encouraged to BF for 2 years, and one of the "benefits" of this is that their husbands are not supposed to require sex from them during that time. I was told this by an elderly Muslim woman. It may not actually be in the Qu'ran.