In the late 80s, while teaching at BUET, we received some fairly large survey data to process. The survey was on Aids awareness and included many questions on sexual habits. If I recall correctly over 20% of youths had some form of premarital sexual intercourse. This was independent of religious affiliation or or location. The numbers were pretty consistent across the board. An interesting data point - a significantly large plurality identified cousins and other relatives as their first sexual partner. I do not remember the numbers for extramarital sex - but even that was (to my then naive self) an unusually high number.
As for drug use and other "evil' vices - from my personal experiences, I'm not sure there is less of that in Bangladesh than say in the US - perhaps more (except for alcohol and that has purely to so more with cost and availability than any religious taboo).
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