OP, I would be pissed off about the lying too, if you had discussed it and agreed porn didn't have a place in your relationship especially. The new things in bed - almost definitely porn related. Stop performing and sending pics for him or you may find that plastered all over the internet.
I used to be unconcerned about porn, did not care either way and watched it occasionally alone or with partner (though admittedly it did not do much for me - my imagination is just fine!).
Having been married to porn addict (which escalated to other things), I have changed my views. Since watching lots of documentaries, I have changed my views. Since having a teenage son who appears to now have little respect for women (I found porn on his phone aged 9 - I didn't even agree with phones at that age his Dad got him it!!)
The amount of teenage boys addicted is horrific (just look at NoFap, and to the OP stating that teenage issues have nothing to do with 'adult' porn use, those teens will be adults, a whole generation of adults who grew up seeing porn and who have unrealistic expectations of sex.
Porn should not be free to access, you should have to pay with a credit card to prove age at the very least.