>>82262251 (OP)
Its really not that big of a deal but consider that its what nature intended and you can see why it naturally feels good. But still, its not that big of a deal. Its like being in the bar having a drink and finding out you can smoke at your table. Pulling out is like 95% of the same pleasure, its just that NOT having to pull out is the slightly lazier, more enjoyable thing to do. Its like taking a shit and having your ass wiped for you. Its easier and thats why some people pretend like its better than it is.
There's just also the whole psychological aspect to it as well. Dominance and pregnancy etc.