Personally, I find it insane and so called new society of sex who believes having sex with sister, mother and friends wife is fine. Myself being a hyper sexual male who has zillions of fantasy. Fortunately, i get it fulfilled with my wife. One more thing is to please your wife at fullest. You don't have to be rocket scientist to give immense pleasure to wife. After all good sexual married life lies in your hand. Of course i get aroused with high heels and boots. It don't make me to chase other GF or any girl i see in street. If friends gf is feeling bad on sex with her partner then he should be aware of it. I personally have learned all these while studying in university. I was very close to many gals but never had sex with those with whom i treated as friend. It is better to pick up on nite stand.
I have been getting informal call from wife friends for watching movie and having dinner when they are out. It doesn't mean that i have to pick up their message and start having sex. What can happen to other can happen to you as well? Of course we men are dog............doesnot mean we have celebrate kartik all the time.
Just avoid it and move ahead. If you do those kind of thing, it certainly will hamper your life. Sometimes watching too much of porn will be bad for health

so avoid her and lead your life...................sometimes jerking of for 10 minutes can help you get rid of all these bad feelings.

Its really sad to see some people over here taking it as light joke and suggesting him to go for it. Personally, who cant please his partner end up not being satisfied by himself. Those people end up going to hookers and others women. Learn the art of love and do it well with partner.