Yes the opinion of experts ought to be respected for practical purposes of avoiding legal problems. As an additional layer one may also put a legal disclaimer before one is allowed to enter the website.
Having said this, there are many law questions that remain unanswered by Section 292 of IPC. Section 292 of IPC is flowing from Articles 19 and 21 of Constitution. Article 19 is nothing but enhanced protection of the rights of citizens, in comparison to same rights of persons already present in Article 21. It means that such enhanced protection for citizens is embedded in Section 292 of IPC.
Besides the word "obscene" or its definition can hardly ever be objective. Usually it is going to be very subjective or hypocritical or rather a lie. Example - when some citizens or persons are seeing any movie or pictures containing nudity and the like, in cinema halls or bedrooms, they will be enjoying such experience or material. But if the same material is shown to them in their place of worship or before elders, they will react in a very different and opposite manner, even though in the depth of their minds be longing to see or experience such things .
An interesting discussion related to this matter can be read at http://www.lawyersclubindia.com/forum/Supreme-court-on-freedom-of-expression-for-nudity-62938.asp