Hey guys my gf(F21) and I (M20) have been together for about like 6 years and we didn’t have sex for the first 2 years because we weren’t ready n young. Around that time we started having sex and one day were hanging out w some usual friends at their house and I said I had to go pee in her restroom . My friend (M20) said he wanted to come with me so we can pee together n a flirting way bc he jokes like that. N I think someone joked about comparing size and my gf said “oo yes I’m curious whose bigger”. What does this mean ? Has she thought about this before? Is she attracted to him? Is she curious for other guys dicks ? If so how can I find out if my gf and friend are interested in eachother without ruining our friendship or relationship?