From my experience, getting your girlfriend comfortable to be sexual with you online would mean to meet the following 4 requirements: 1) So you want to let her know that you’re comfortable, so that she can be comfortable too.
She needs to know that you’re okay with it, and you won’t change your opinion about her if she does it, or you won’t judge her for doing it.
But, still in the back of her mind she’ll be worried about such things.
But if she’s comfortable being sexual with you online, without bringing up this issue, then you don’t have to bring it up either.
So unless you’re asexual or dedicated to religion, then sex is an important part of your life, and satisfying your sexual needs is probably an issue that takes a lot of time and energy in your life, especially if you’re young.