It is evident that lube is something introduced later on by more innovative thinkers into sex. The body does indeed have its own natural lubricants and when it is needed to augment these natural lubes is something extra used.
The need for lube in anal sex
That the body has its own lubrication systems is evident from nature. But if you look at the anal sex, it is seen to be something against the flow of natural systems. It is in fact a flow against the designs of nature and hence a bit of extra help is need to keeps thing comfortable. This very unnatural action is what calls for extra help in keeping the movement going.
With more varied uses of the lubes came about jellies that were flavored, colored, etc. it would all add to the variety and is not really meant to do anything else.
When enough is enough
With the majority of user of lubrication there is never something like enough lubricant. The very economical nature of the product enables most users to ply on the lube as much as possible. This could be at time not advisable. There are instances when the lubes have gone on to stain or cause color patches on clothes and other fabric. Thus the tendency of using more than enough must not be encouraged.
Does flavor and smell matter
The need for flavoring a product that is to be mainly used on the anus is a mystery. Perhaps it is more of a titillation effect that a flavored jelly could provide. There have never been reported any difference to performance with plain jelly and flavored jellies.
In all probability it is a marketing gimmick that would help sell the product. There might be other ways it can come handy only which the introducer of the concept of flavored lubricating cream can explain.
The ease of procuring a tube
In the earlier days gents and ladies used to wait till the crowd thinned out at the chemists to rush in and have their fill of a jelly tube. But the internet and online shopping has added new avenues that need not rely on people for privacy. It is now possible to order a jelly tube no matter the time of the day. Most vendors would send the goods covered in proper packing that does not let out to the outside what is in the inside.
There could no longer be an excuse to not get the hands on a tube of lubricating jelly. From the days of yore when the real stuff was not that easy to come by, this has been a long journey since.
The cost of lubes
That the lubricating jellies and creams are affordable to all sections of society would be a comforting thought. The constituents of most jellies are cheap by products of other processes that need to be disposed off anyway and to make money out of it would be heaven send.