Well its ok to marry them but what about afterwards. The society in India plus a couple wanting kids will see to it that this isn't a success.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/politics/28581-indian-sect-members-vow-marry-sex.html
There are better ways to reduce sex workers. Tell the men to masturbate instead. Its like a time when my Aunt called sex worker 'Randis'. I got a bit angry at that. They're sex workers because sex is a big business and men go to them in most cases.