Thanks. I actually read it just minutes after making my post. As I was typing it I figured this would be good place to find a thread on the subject.
I guess it all comes down to what you consider as natural selection (NS). If it is selection by nature (which seems reasonable) then sexual selection (SS)
should be included in NS.
But I could also easily imagine that to some SS
could be seen as a force driving to speed NS up by having the individuals chose those mates who not only survive long enough to have offspring, but tend to have offspring that will in themselves survive.
That is, SS sees one step further than NS.
(Off topic: I just realised it's "beside the point". Or does "beyond the point" work too?)