The Beatles' descent into immorality was hastened by their adopting the wrong crowd to be their peers. In their earliest days, they played small gigs in Liverpool, England, a city that at least had some semblance of morality and cultural expectations.
When they began making regular trips to Hamburg, Germany, they became immersed in a godless culture so wicked and vile that I will not even mention some of the vices, though 55 years have passed. The night life sins of Hamburg then would make the worst night life sins of the USA look tame now (maybe an exaggeration, but not by much).
Parents, pay attention. The crowd your children hang out with will profoundly affect them spiritually. Become your older teen's #1 best friend. Try to make it attractive for them to bring their friends to your house. Pray earnestly for God to send Godly friends into your children's lives.
Twitter @john316marshall
www.facebook.com/john316marshall