From context I'm assuming you were using a university internet connection to view this material? (edit: now confirmed by OP)
Most if not all major universities have some sort of "acceptable use" policy governing student & staff use of IT facilities. For example, here are Oxford's regulations. Some key points:
- Users are not permitted to use university IT or network facilities for any of the following:
(2) the creation, transmission, storage, downloading, or display of
any offensive, obscene, indecent, or menacing images, data, or other
material, ... except in the case of the use of the facilities for properly
supervised research purposes when that use is lawful and when the user
has obtained prior written authority for the particular activity...;
(4) the creation, transmission, or display of material which is
designed or likely to harass another individual in breach of the
University’s Policy and Procedure on Harassment;
(9) the creation or transmission of or access to material in such a way as to infringe a copyright, moral right, trade mark, or other intellectual property right;
(12) the deliberate or reckless undertaking of activities such as may result in any of the following ... (f) the introduction or transmission of a virus or other malicious
software into the network;
You should check your university's policies, but they will almost certainly have similar rules to the Oxford ones that I quoted. Many institutions require staff and students to sign an acknowledgement of their rules in order to receive IT access.
If you're viewing porn through your university internet connection, that's an obvious breach of #2. You might also run into some of the other provisions if you're viewing pirated material, if you're viewing it on an untrustworthy site infested with malware, or if anybody thinks you deliberately showed them porn in order to harass them. (The latter probably isn't an issue with the interaction you describe, but it's a risk you face if you don't keep your porn viewing separate from your academic work.)
So, if your supervisor decides to report this, you could very easily be in trouble. Depending on your university's policy, your supervisor may even have a duty to report it.
Whether they will report it - or what will happen if they do - is another question, and this board probably can't answer that. Some people and institutions are relatively slack about enforcing their policies, others are very strict.
I also don't think there are university guidelines that prevent us
from accessing adult content.
I would strongly advise you to check that. It would be extremely unusual for a university (or any other large organisation supplying internet access) not to have some rule along these lines, even if enforcement is light.