So how is that different from Calvinist sex?
which degree is consented sex
I suppose it would be either zero or infinite, depending on how you conceive of it. Consensual sex isn't any degree rape, but the degrees usually get worse as they get lower, so that's probably not the best way to think of it.
biblical sex for widowers
Paul specifically teaches that remarriage is a good thing, especially encouraged for younger widows. He encourages older widows to try to devote their time to ministry in a way that only their new singleness would allow, but he doesn't make either a rule. Much of what he says would rightly be applied to widowers, but he deals with that specific question a lot less explicitly.
How interracial marriages effect other people
As far as I know, there's only one way to effect other people (at least legally in this country, since cloning is illegal). That's through sexual reproduction. I'm not sure why that should be any different for interracial marriages than for any other.