Oh, exponential growth in love and care

Oh, so chaste and pure, my husband said
As  I took but him into my bed
I didn’t know I could have taken   two
He had wit  but I had  got no clue.

I’ve never heard of weddings with two grooms
Is this legal, what is here presumed?
I would have thought two brides a better deal
They could share their worries and their meals

Am I lacking  brains to miss the clue
That if you marry one, you might take two?
Then for each one another must be  found
So I’d have four,  eight, sixteen  kiss my hand

Oh, exponential growth in love and care
This seems odd, how  could I even share?