I'm a full time college student...so yes my mind is on other things most of the time anyway. We certainly don't constantly focus on sex, like the Church wants you to believe. Do you suggest I also never sleep again at the risk of having a wet dream?
Wet dreams we have no control, not even erections in our sleep. But being fully awake, in full control of our thoughts, yes, we can choose our thoughts.
What you do based on your thoughts is your choice, not Gods. (Upper case G)
God gave us a warnings against what He knew what our limitations were not.
Only we can venture into those areas at our own pearl.
Because God gave us the ability to choose from all the vanity there is in the world of the flesh does not mean we have to indulge willingly.
If there were no rules in a society, the society would eventually run amuck.
The attitude "do what we want, what we please" answers to nobody, not even to self.
So, why should any rules matter?
The meaning of life is made worthy by being victorious over vanities that would work to destroy us.
What is vanity if not defined?
If the bible defines a vanity in humanity, then we have a choice.
Be it as it may.
Blessings, AJ