It certainly is important not to proceed into human relationships without the valid consent of the other party, especially by initiating offensive force. Sometimes you understand that, other times not...
Why do you think you sometimes disregard that ?
Consent? Okay, I'll play along for a bit. But I'm gonna have to go get a beer and find my lighter. Hang on while I go raid my neighbors fridge, I don't need their consent right ?
What is valid consent in a generic way and what is valid consent in a sexual way (if you insist on making that part of the conversation), ?