Because the general consensus is that if they fall in love they would leave us for love with the bull. But I have found that it’s just the opposite.Same here. I initially thought I was only interested in seeing raw sexual intimacy, but quickly I have developed a huge thing for her getting romantically involved with another guy. Its interesting how its changed for her too (very quickly, like over a couple of months). At first she was like "if I start getting feelings for him I'll cut it off", now she's like "I'd be happy for him to be my boyfriend". The idea of them falling in love but her still loving me is both a turn on and something beautiful at the same time.
Especially if they love being shared. Why leave this for a bull that may want you all to himself when you know you can stay in the marriage and have that bull and more. Plus the love I give my wife can never be duplicated. Yes she can get fucked better but the love she gets from me is second to none. Best of both worlds for her.