How do I delete sent/received pics from my Galaxy S6?

[AC Question]

How to delete sent/received pics from galaxy S6

I have a Galaxy s6 and I received a text with a pic of a guys junk in it by some random person. I can not for the life of me get it off my phone. It is not in my gallery or in my folder it's only seen when I go to send a text. It's in the sent/received folder that I cannot find. My kids are always

 

[lucianus_luciferus]

tap and hold on the text msg and chose delete