The BIG Disconnect

So. A current conversation has given me new material to ponder about. The 'Honeymoon Phase'. We were talking about marriage and I was explaining that I fear 'my guy' isn't out there. Who is my guy? It's complicated. My Guy is the better version of my love interest... and more. I really like the beginning of a relationship, because that's the guy I want. Over time, as we all know, we find out the honeymoon phase was as it named itself to be... A PHASE. The real thing pops it's ugly head out for all to see. I try to be the same throughout the relationship so I attract someone who remains constant too. Someone dedicated to excellence.
Then my guy friend pops the fantasy. Why does a guy even bother with a honeymoon phase? Sex. I don't get it. I don't see the point of faking your personality for sex, but I can't judge. I've never had a penis and I have no clue what men go through relationship wise. Of course, that's why prostitution is a big business, because relationships are taxy. Men need to jump a million hoops to get a pussy pass. A car, a crib, a job, extra cash for entertainment... bla bla bla. Most men need to be on their best behaviour until they get laid. Most men know they need to be super boyfriend in the beginning to keep you. That goes for both sides too, a lot of women pretend to be someone better than they truly are in the beginning too. Lemme throw this out there; What if, nobody pretended? What if we were to be the best version of ourselves twenty four seven. What would happen then? Two people + 100% of themselves = A Quality Relationship? I should hope so!