Almost all prostitution customers are (straight and gay) men. Women only go to prostitutes for very niche reasons. For example if they want something that requires special skills - after all, the "basic package" is easily and freely available in a much less socially stigmatized way. There's also work for male prostitutes servicing older wives whose husbands travel too much. But all of this is really niche. Women tend to want less partner variation. Single women with high sex drives just take someone home from the local nightlife.
There's no question that almost all prostitution customers are men.