I'm not sure about the "trying out other girls" part.
A threesome, if all three of you are comfortable with that: no problem, but to experiement with someone else on your own: that just sounds slippery to me.
In addition:
Love is more than just "sleeping with a girl" (or guy). You "trying" out other girls will not, ever, confirm your love for Sarah. At best it might broaden your sexual horizon, at worst it will create jealousy or sexual strain on your relationship. Either of those could possibly destroy your relationship with Sarah.
No matter what she offers you (and she could have the very best intentions), the truth is that the effect of such things cannot really be predicted. I say: if you're truly happy with what you've got, do not put it at risk!
(and that advice goes for the both of you!)
With regards to the possible threesome, jealousy is a big danger in such encounters. Many people can enjoy three (or more)somes and keep their relationship intact, but it is not a given!
Be communicative about it (and everything else ofcourse!). It sounds like you've got a good thing going. Be progressive (i.o.w. don't be afraid to try new things, adjust and develop) but do it at a comfortable/safe pace.
And as has been said before: communication is key!
__________________
"Do not kill. Do not rape. Do not steal. These are principles which every man of every faith can embrace. "
- Murphy MacManus (Boondock Saints)
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