>>935911612 (OP)First off, the dick on the left doesn't look fully hard and the one on the right looks like he's been using a cock ring and just took it off.
Beyond that, different people enjoy different things, right? Well dicks can be different sizes and so can pussies.
You can also think of it much in the same way that eating a double bacon cheddar burger can taste delicious, eating it everyday is going to be unhealthy and probably make you want to puke. So unless a normal cock is like a Hotdog going down a hallway (damn girl, do some kegels or some shit), the novelty of taking a massive cock every day is going to wear off and the girl is going to be left with a sore pussy all of the time.
From what all surveys of women show, after a certain size there is mostly just pain. If I remember correctly, the ideal size for a erect dick for a partner was 6.5inches and for a one night stand/sex friend it was 6.8inches. Do with all of my ramblings what you will...