Another point we must remember is that these people already find themselves compatible in many other areas, and in my opinion, the chances that they are off by a lot in the area of sex, is slim. I hope I haven't been too long or too incoherent. Calling marriage a divine institution smacks of Xtianism with its marriage of God and church. Perhaps Boteach is more influenced by his cultural surroundings than he would like to think. But, as in most truly Jewish discourse, we deal in that case with the meaning of an institution, rather than its ordination.
Marriage has a divine meaning or interpretation.
Such a statement seems specifically Jewish, part of what Jewish spirituality has contributed to human life. The statement that God invented and commanded marriage and that without such command humankind would not have invented it is not Jewish in feeling or inspiration. Literal and simple-minded statements find rebuke at virtually every point. Marriage IS a purely heterosexual institution in Judaism. The Torah forbids homosexual conduct.