an analogy to a relationship with a third party

over lunch cum dinner today, 8 scholarly organic chemists came up with this analogy:

in a relationship (as in boy gal), it there exist a third party (let's say another gal), this other gal likes this guy even tho he is already attached.

thinking of an Sn2 reaction mechanism,

so this is like saying the gal is the nucleophile (a specie that is nucleus seeking) while the guy is the electrophile (a specie that is electron loving).

so the electrophile will attack the nucleophile, from the backside 180 degrees away (unknowing to the existing girlfriend).

the guys existing girlfriend (who is the leaving group) will have to be kicked out of the picture.

how well the leaving group leaves will depend on several factors:
(a) the situation/environment (the solvent)
(b) the character of the leaving group (more independent = better leaving group)

unfortunately, there are many technical terms in this analogy so I hope ppl reading it will not find it disgusting..