<human>: Hi Guys, i'm a 20 year old male with girlfriend of 5 years 19F. She is wanting to engage in an open relationship and explore her sexuality with some other people (potentially older / more experienced or with other girls) and also wanting me to do the same sort of thing while still keeping our relationship at the center.

I'm having a few issues with this idea from an emotional perspective. My mind is saying sure why not, but emotionally it doesn't sit right. Some of the issues i'm having are that I can't imagine the thought of another guy having sex with her, however slightly more okay with her with another girl. I feel a whole heap of emotions about it and i'm having a hard time figuring what these exactly are.
I a few of the emotional things that i've felt about it so far are:
- I've always viewed our relationship as quite special and something that only us should share but at the same time my mind is okay with the idea of opening it up for experimentation
- If we did do something, i'd rather it was something that we both did together, such as her experiment with a girl with me there also joining in. Not sure of why I might feel this way.

But apart from the few thoughts i've had above i'm having trouble working out what i'm feeling on this, it all just seems so confusing. Its making me feel anxious and confused and not sure what the next step should be.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Girlfriend wants to open up our relationship for us both to experiment (both me and her). Feeling confused and anxious. Not sure how to proceed.