The definition of lesbian has been and always will be the romantic and sexual attraction between 2 females. There never has been nor will there ever be a penis in a lesbian relationship.
You can put the penis under a pair of panties and/or under a skirt or a dress. You can even try to convince the ignorant and those without the capacity to think critically that the penis is a female sex organ; but the fact will remain that it is a penis attached to a male body and neither belong in a lesbian relationship.
Shaming, guilting, and/or intimidating lesbians into accepting the penis as a part of their sex life is sexist, misogynistic, and could even be considered sexual assault. Dare I say, some might even consider that action to be lesbophobic.
Lesbians do not want to have sex with males and their penises, that is the very definition of what it is to be a lesbian; and no amount of rhetoric, no amount of screaming about transphobia, no amount of coercion will ever change that fact.