Yes, Henpecked was the g-rated version of pussy-whipped with the same result. Too bad for your friend if he is actually miserable in this relationship. Could it be that pussy-whipped could also refer to a lack of balls in this case? I have known people who have suffered in relationships but chose to do nothing about it.
My modern day version of pussy-whipped is another word for submissive male. It is a much more exciting version and it includes two words that alone would cause arousal in myself, pussy and whipped. Pussy is an important part of my submission as it is the distinctive and defining part of the female anatomy. You could also say that I was ass-whipped, leg-whipped, hair-whipped, lip-whipped, eye-whipped, asian whipped and on and on.
Those who may have accused me of being pussy whipped in the past, have no idea of the levels of submission that I am capable of as long as the partner is right. I don't really even know myself but look froward to finding out.