Non exclusive dating relationships
Twins often have strong ambivalent feelings towards one another.
For identical twins, people not bothering to, or not being able to, distinguish between them is likely to reinforce the twins' tendency to be seen as a unit (the twins) rather than as two unique individuals.
Like singletons at this age, twins are also seeking to define themselves, but for individual twins this often involves trying to redefine themselves as "not the same as their twin".
I cut my long hair into a much shorter style (to contrast with my sister's hair which she kept long).
It might be fun to fool people by switching places (and they sure love using this as a plot line in trashy novels) but in reality twins can't be simply switched for each other.
For a short time you can act like each other and maybe even fool people close to you, but ultimately even identical twins are different.When my twin sister and I went our own seperate ways, it was hard to deal with being apart.