neighbour eyeing wife

[pylode]

It is her body and her desires. If she disliked it, she would have complained about it or even protested. So far she hasn't which means she likes it and is an active participant. In biological terms, she is a female in heat encouraging a potentially attractive male to make a move to inseminate her so that she can carry forward his superior genes. You are just a social construct who can at best slow down but not stop the inevitable mating that will happen. It's a question of thousands of years of social norms vs billions of years of evolution. 

The only way you can make yourself useful in this process is by encouraging her and possibly helping them during their mating.

   Hi Chandu,
           
I think what indicouples have said is cent percent correct. In case your wife found the touches & looks of your naughty muscular neighbour objectionable, she would have told you about it or she would have kept a clear distance from him. But she did not do that, means she is getting a hidden thrill from his attentions!
           
indicouples is also right when they say that the hidden side of your dear wife is looking for superior male genes to impregnate her & carry forward a stronger next generation. 

Well said indicouples, your are a brilliant sociologist-cum-sexologist! I think I need to get my mature wife examined by you (her mind, not body!).

     pylode