However, you can meet girls at the Hotel clubs just for friendship, but many of these girls are from Uzbekistan or Russian.
If I were single I would want a more traditional relationship.
Since Muslims do not drink (I think that is an excellent rule, as I do not either) people do not go out ad pick up girls under the influence.
In other words, getting a Karachi girls mobile number and maybe having her fall in love with you.
This is a long article so you can print it out but try to read the whole thing as it has useful information and resources.
If you calculate that it has 18 million inhabitants then 9 million must be females.
Of those according to demographic statistics about 5 million are single girls in Karachi and of dating age (there has been a baby boom since about 1975 so the number of younger single females 18-35 outnumber the older ones). The religious breakdown of Karachi is 96.5 % Muslim, before the partition with India there was a larger Christian and Hindu population.
If you would like to have a one night stand, or regular discreet pleasure with a local lady, have a browse through the ads offered in the Women Looking for Men category.