If you're a married man capable of fulfilling his marital obligations, and if your wife is an American, it would be true for you to say that you've had sex with an American. If you were once married, then divorced and married again, it might be true for you to say that you've had sex with Americans (plural). In the absence of more evidence, you don't know what Ruse's personal life is like and your willingness to speculate says more about you than it does about him.
Not that any of this is relevant to the truth or falsity of any philosophical or scientific claims he might make in the context of the present discussion.
In the absence of more evidence, you don't know what Ruse's personal life is like and your willingness to speculate says more about you than it does about him. Some folks are not familiar with reason, and prefer to spout off without knowing anything. Such folks make many kinds of errors, such as conflating natural laws with TRUTH.