Good gracious!
BluECliQ....I agree with the others here urging you to communicate with your g.f.
---the sooner the better IMHO.
Her attitude (and behavior) is not ever going to be conducive to a meaningful sexual relationship if she insists on viewing a natural function of the male body as "disgusting".
Aside from your asking or insisting that she do something against her will (such as tasting or swallowing your semen which some women DO detest), her attitude itself towards your ejaculating leaves much to be desired. I have to wonder if she will EVER be totally happy with ANY man sexually--given her current antics. Many men might find the "messiness" of a woman's menstruation as less than ideal, but we accept it as part of how humans are....we go on. We "grow up" and find ways to adjust to what we can't necessarily change about our bodily functions. We don't deliberately set out to hurt someone's feelings over it.
I suggest either of two ways to address this.
One....In a calm, kind, (but definitely serious tone) I would take her hand and say: "Hon...we need to talk. I can allow for a bit of fun, humor, even some kidding when we're making love. But your feelings toward my climaxes and ejaculations are NOT really helping EITHER of us. If you find what comes naturally to me as a man as obnoxious or disgusting, then I don't know what to say or do about it! I'm just like every man, you know...this is how we're made and how we function. Do you WANT us to be happy together? If so, then this matter has to be resolved before it becomes a real issue, which it surely will! I hope you will want to work through this and I'm willing to help you. But I'm not going to be able to change how my body works!"
Two....Write down this message to her and ask her to read it and get back to you.
Many of our readers in the forum may find some humor in all this happening to you BluECliQ, but I do not. (Fortunately, our posters here thusfar haven't either.)
As I'm sure you already do, I see this situation with your g.f.'s reactions as alarming....alarming to the point that she is willing to (and, going to!
jeopardize perhaps an otherwise meaningful relationship--sexual or not. I find it just short of insulting to you, myself...particularly since she seems to CONTINUE responding this way. (Forgive me, but she is reminding me of some silly, giddy child! --Not a "turn-on" to any man whatsoever. Gosh! I mean REALLY now...just think about it!
If you extend an effort to be nice to her initially and seek a (calm, peaceful) solution to HER problem ( not yours ), then you've done about all you can do. NO man would tolerate this forever without it erupting into a more serious matter which definitely WILL affect a relationship. Best wishes.