Step 3: Get a Merchant Processing Account so you can accept credit cards. There are options here. I personally recommend getting two in a cascade. Use Mobius Pay for credit cards. Use Epoch to accept Paypal. Yes, you can accept PayPal on your porn site, but the ONLY way is with an Epoch account. Initial costs: $1000 upfront for Mobius and also $1000 upfront for Mobius to cover your Visa and MasterCard fees for the first year.
Here is a deep dive into Mobius with Lasha Lane, Jonathan Corona and Lance Hart.
Here is a deep dive into working with Epoch with Frank and Lance Hart.