Most Helpful Guy
Unfortunately this is a feature of the internet - You are right to block if you are uncomfortable with messages - You are aware of privacy settings for your profile.
(1) You can say only receive PMs from people you follow
(2) Make your profile private1
Most Helpful Girl
It's always the messages I get that they aren't horny and aren't seeking for x rated conversation so then I proceed and ask them what they'd want help with and then they go into pervertedness but trying to act dumb1