Thanks. Interesting, I had not heard this theory before.
Did it ever occur to you that in a society where widows are regularly married to men who can afford another wife they might not think highly of that sort of thing.
On the other hand, the seedless dessert grape was developed right there in that part of the world. Someone explaining what Heaven is like to a potential convert would be in good stead comparing it to a bunch of sweet dessert grapes.
There are many other parts of the Koran with similar problems.