Fucking wife with hubby watching

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Hi all
The wife and I got chatting (my big turn on is seeing her with another cock) and started wondering what it was about the situation that turned the guy on. Maybe you studs who fuck wives with hubby wanking/watching could enlighten us?

So far our main guesses are the power with hubby watching or maybe hubby isnt part of the turn on and its just about the sex.

Thanks for any replies

Jim and Katie
xx