I Want Others To See My Nude Wife

One of the most embarrassing things that I hate to see if to have my father around when my darling is nude. Though age is not a number when it comes to love and sex, knowing that he is my father I find it so embarrassing when I am greeted back home to see my dad on the couch enjoying the TV with my wifey nude on his laps. And it's also yuck to talk about sex / love to him. I don't know if this is a father and son problem. He had no problem in communicating back on these topics but I am uncomfortable. Kavita loves his company whenever he shows up at the front door. Since he was in the army, retired now, he spends most of his times in the north and visits us whenever he wants during the year. When he knew about Kavita's fetish he was more happier than me and he was the one who encouraged her more to be honest. Kavita too loves his company due to his ordering tone and the naked challenges that he does on her.
Sometimes I even ask myself if I'm the only son here to face such. I kind of feel a bit shy and embarrassment to see my wife nude with him. It might be because he is my father as Kavita had been nude with other men and it has only made me hornier.