I want to read SN 48.40 but it's not available at accesstoinsight.org. I couldn't find it from google either. Can you please provide the link to any english version? Would you mind to give some example of pleasant bodily sensation? Examples can help in understanding what you mean by pleasant bodily sensation.
No link. But Buddha says there very interesting thing. He says about 5 feelings:
1. Pleasant feeling experienced by bodily contact
2. Unpleasant feeling experienced by bodily contact
3. Pleasant feeling experienced by mind contact
4. Unpleasant feeling experienced by mind contact
5. Neither-pleasant-nor-unpleasant feeling experienced by bodily or mind contact
Then he says that:
Feeling №2 totally ceases in the 1st jhana
Feeling №4 totally ceases in the 2nd jhana
Feeling №1 totally ceases in the 3rd jhana
Feeling №3 totally ceases in the 4st jhana
Feeling №5 totally ceases in the nirodha-samapatti (that is also nibbana, where "there is nothing felt at all")
So, in the 1st jhana feeling №2 completely ceases (that is why there is no bodily pains in the 1st jhana and you can sit in meditation for hours). But, as we see, he does not say that pleasant bodily feeling ceases also. No, instead he says, that pleasant bodily feeling (feeling №1) ceases in the 3rd jhana. So, as we see, while in the first and second jhanas you experience pleasant bodily feelings. However, even in the 3rd jhana there, as it seems, there is still a bodily feeling - that is №5. It seems such kind of bodily feeling ceases only in arupa-jhanas. While such kind of mental feeling ceases only in nirodha-samapatti.
If sense-based perception exists in the 1st jhana, then you might have different interpretation of kāmasaññā. What do you think kāmasaññā means?
I think this is a perception of kama-nimittas. That is, for example, while seating in such 1st jhana meditation, this is impossible that some fantasy about sensuality will appear. While not in jhana some thought or imagination or "picture" may pop up that will cause sensual craving to arise immidiately. That is a trigger for one of the hindraces. Anf in the 1st jhana you have no such triggers.