Although there is no law which defines which words are s**ually offensive words while defining the guidelines,
It depends on how the content defines the domain.
I was also reading if the adult content is more with educating the audience, awareness , it is fine (only if the content and the agency provding content is registered as a legal entity in the mentioned business like doctors, NGO etc)
Excerpt from an interview with Pravin Anand (Pravin Anand is known as the leading IP lawyer in India)
Adult web sites are restricted as being against public morals and decency. Most registrars and hosts will not register or host web sites which contain adult contents including pornography, warez sites etc. However the discretion as to what the âadultâ material is has been left entirely to the registrars and hosts of web sites.
Also, if we see the hosting companies, even they have not defined what is Adult correct/acceptable website.
Excerpt from the end-user agreement of a leading hosting company
(B) THE INFORMATION AVAILABLE ON OR THROUGH THE ************ SERVERS WILL NOT CONTAIN ADULT-ORIENTED MATERIAL OR MATERIAL WHICH SOME INDIVIDUALS MAY DEEM OBJECTIONABLE; OR