Every so often my profile gets followed by an account of an adult nature obviously spam. Its not that obvious of how you can block accounts.

The following link https://support.twitter.com/articles/117063 explains how.

So to block an account that has not tweeted you you have to first go into their profile and block from there. Why cant you just complete the action from your own account withoyt having to navigate into their profile. Does not seem unreasonable