I thought this post was just a crazy rambling but it turns out it's relatively accurate. I presume this sex scene is meant to be an arty farty metaphor of some kind.
The initial sex scene showed the boyfriend prematurely ejaculating and apologising for it. The second sex scene showed the clonebot could go all night. In other words a sign that the clonebot as much as it tries to isn't and will never be a perfect replica of him.