Absolutely nothing wrong in knowing our limitations. I know I can only penetrate my wife for a couple of minutes before cumming which is why I spend most of my time pleasuring her orally so she can cum first. I also know she has a greater sexual appetite that I can't fill. So we agree that having a bull for her is the happy compromise. While it is sexually humiliating it also gives me joy to see her receive the pleasure she craves. It also brings us close to have me clean up after the bull leaves her full of his seed.