Its only on eastenders you always get caught out. In real life it's much easier. In truth I'm shocked by this as I think people are lieing to look good. I have a large circle of friends and I can count on one finger those that haven't had a bit on the side atleast once.
I also work in a large male dominated environment and can see the stats for guys there that are banging anything that moves.
Lots of my friends to the outside world have great relationships, yet everynow and then fancy a break from the norm. None of them have ever been caught and it happens once a year not a second relationship.
2 of my work mates ive known to have a other half for 5 years or more and never been found out.
Ive sat round friends houses were cheating has been discussed and a mates wife is saying " x wouldn't cheat on me, he can't lie to save his life etc etc" and how morally it's all wrong. When we leave both my wife and I laugh our arses off and my wife knows she's been banged by dilbert up the road and my mate has cheated on more than 5 occasions.
I do believe you can be happy, blissfully happy with your partner but still have a dabble every now and then.
The funniest thing is this girl being described as a bike, because she may like sex. So what, its not the 40's anymore. She may practice safe sex everytime, hardly the crime of the century.
Also regarding porn not hurting anyone emotionally, one of my best mates had his house destroyed by his wife who found his porn collection in the loft. She took it as an slur against how she looked that he would even need to pleasure himself over another women.
We are always been told what instincts in life are natural, well a man wanting to spread his seed with any women his finds attractive is a prefectly natural reaction as well.
I'd say to your mate, no this time because everyone knows about it, some girl while you out on your own, staying in a hotel who you randomly hook up with....
Fill your boots and keep it to yourself.