Why don't I orgasm anymore?

Hi guys!

Okay so lets get down to it (no pun intended😏)  I am 18 years old, in a one year relationship with my boyfriend whom I love só very much❤️ the thing is, how ever, that maybe for the last 3months or so, I haven't orgasmed! 

We don't spend as much time with foreplay anymore, and sometimes we're stoned while having sex (I don't know if that makes a difference😂) 

And I really feel like I want to cum and just completely lose it- the sex is amazing. But. I. Do. Not. Orgasm. 

Its definitely not all about that of course- but come on, who doesn't want a big O every now and then. 

When I get sexy with myself- I love to watch lesbian porn! But I'm hella straight and don't feel sexually attracted to other girls when I am in their presence or what ever. 

So I have no idea!

Any tips ladies?? 

Thank you so much, I absolutely love this eve community!❤️❤️