How to get along with girlfriends friends?

Generally speaking all females see men as a potential mates and all men see women as the same. Being in the same social circle automatically opens things up to flirtatious allowance, conversation,ogling and touching to a degree like hugging or butt smacking. End of the day you go home with your girlfriend, but if she leaves you and has to move on she has left her mark and you can call her go with it dude let her take the lead though and just be friendly flirts. For guys it's the same,but it's more fickle we have to be good buds with our bros for a while and the rule kinda flows into hugging and,eye contact and general conversation along with number exchange. It's quite simple you walk up to a single girl and make an acquaintance,you get a date and later you can flirt,touch and kiss her but if she's not single your just a creep and if a gal does that to a guy who is taken then he is flattered and backs away. Think of it as a number 2 then 3 only if their single and friends. Of course you can limit this around your girl and in the end she wins,unless it just doesn't work out that's why we have social groups it's all related to sex with us humans.