Your best friend's partner (who you find very attractive) begins to flirt with you then suggests a one-night-stand sexual encounter. Your friend will never find out. Do you do it or not?
There are certain sins I may never forgive myself for, this is especially when I know I have images or figures of something that reminds me of it. No, I wouldn't, I can't stand so low to betray the trust my friend has for me because of a night stand that may not last, rather, it would leave a scar in my heart that pricks me every time I see him. Sometimes we need to crucify our desire for pleasure for something greater- In this case, friendship. Some friends are more like brothers, our happiness is theirs and our sadness is equally theirs. This means, accepting the night stand is betraying someone who sees me as a brother.
Friendship is built on trust, whenever that trust is broken, it fails to stand even though one party remains ignorant of it. There are many reasons why I wouldn't do it, they're;
Guilt: I may never be able to forgive myself after such an act. It's possible I wouldn't realize how much damage I've done to my friendship and that of hers until the deal is done and all that's left are regrets and bitterness.
Tendency to repeat itself: Sometimes it doesn't just end with the one night stand. She or myself may want to keep a secret affair with her that may last longer than initially intended. As it grows, we both may start to change and desire the worse that would leave my so-called friend heartbroken.
Cultivate Negative mentality about women: Negative mentalities are developed from our habits. If I happen to have a one night stand with my best friend's girlfriend, I may come to a stage in life where I don't trust women and my friends around her. Lack of trust for a thing arises from experiences and our lifestyle. So, as I take chances with my friend's girlfriend, I'll also be cultivating a negative mentality.
Karma:" what you do to others, in the same measure would be done to you. I fear karma, as long as I don't want the same to be done to me, I'll avoid doing it to others. It's easier to flee every form of temptation than go face the consequences that lie ahead.