Verotel is a great company for Adult business and can be trusted I have known them since 2001, I just wanted to mention them because I saw a rep. from this company commenting above.
General speaking, if a business can't get approved by the regular Merchant Account providers i.e. WorldPay, WireCard, Stripe and what else they are then it's most often because of the nature of the business and most often because the CB ratio is too high or the ticket price too small.
So if you got in this situation and you post on a public forum for help and you get replies as I have seen here you rally need to be careful and check every processor as much as you can, for reviews on Google, domain history, where they are located, are they AIS certified are they using some cheap template is thei About page and contact page looking fake what about the pictures are they real or from iStock or Shutterstock! There is much you can do at your own to avoid to loose months of earnings at the end of the day.