Thank you for reporting the issue. I have forwarded the same to the ad networks to filter it out from our site immediately.
As you will notice that India forums ads pool is comprising of many different ad networks. Before signing up with them we do check the quality of the ads and the have strict ad filters set so that it doesnt show not just obscene ads, but also ads which promotes alcohol, gambling, spywares or any other such nuisance. For that matter we do not even show Popups or Popunders.
And probably this particular ad has skipped the set filters.
It is generally hard to identify which ad network is showing that particular ad. Incase you see any such ad again just try to see the source of the ad image by right clicking on the banner and let me know about the same.
Thanks once again for taking the effort in bringing up the issue as we also do take this issue verry seriously.
Regards,
Vijay