Since you have no physical problem getting an erection, I think it's a pretty safe bet that it is a kind of performance anxiety. Ditto "relaxing," which I am assuming is secret code for "smoke some pot. If you're putting her on a pedestal, consciously or unconsciously, she might seem too good to fuck. So when I text her that If she would send me some nude pic and video. I feel the same way sometimes. Some people think that sex is no big deal, but others see it as something they only want to share with an extra-special person. If you've been with your girlfriend for a long time -- or not so long -- and are ready to take your relationship to a more intimate level, you must be wondering if she's feeling the same way.
Besides, it only works while you are wearing it.
My girlfriend masturbates after we have sex. Why?
If you can perhaps do some naked, bodies-together, perhaps standing, makout sessions, and see how things progress, that may point to what you need to do. Realy helpfull dude,especialy relaxing part. This is a very known misconception of how "nice guys finish last. Another thing I do if its been weeks without any sexual contact is I take a shower washed and fresh and minty and come to bed naked and hard. Thanks for letting us know. Continue pleasing her and try to move forward again in a few minutes. Women seem to sleep with guys more when they are just dating and live apart because there is a fear of losing the guy, so she has to keep his interest by keeping things exciting.