After reading the verses 23:5-7, with a cleared mind, my interpretation is as follows,
"Those who guard their private parts...." Question is to the spouse, what is the specialty about this private part guarding? It's not that wife makes you urinate that u can't do it by urself which becomes illogical. What does private part do with spouses? Urinating or sex or showdown? It is sexual arousal. And that sexual arousal is indicated in normal human sense. So in my view, verse getting cleared if we interpret like this,
"Those who guard their sexual urges/arousals except.....". Then it makes crystal clear. Sorry for direct words. Please give some feedback on it.