abaya

Yeah, I dunno about masturbating more... I mean, to fulfill your own needs, sure. But if you aren't solving the root of the problem, which is the change in her sex drive, then more masturbation and porn-gazing will only make you more bitter, distanced, and unhappy in the long run... because you're MARRIED, man. Sex is not everything, but if you are incompatible in any way in a marriage (emotionally, spiritually, sexually, etc), then no amount of self-pleasure is going to save you.

Have you said to her,

"I feel hurt when you only want to have sex with me once a month."
"I feel like you don't find me attractive anymore when we don't have regular sex."
"I feel rejected when you don't want to have sex with me more often."
"I feel like you care less about our marriage, because you aren't willing to work on this problem with me."

Then, if she replies positively...
"Would you be willing to see a doctor/therapist/etc? We can go together."

etc. etc.

__________________
And think not you can direct the course of Love;
for Love, if it finds you worthy, directs your course.
--Khalil Gibran