Both of the posters you shared are FUCKING MENTAL!
I am bisexual.
I have had sex with men and women.
Imagine being a lesbian and being told that you can have penis sex with another lesbian.
You can use a strap on which is not a penis - yes.
You can use a vibrator/dildo which is not a penis - yes.
You cannot have penis sex without a penis in your vagina.
By the same token, a man who enjoys buttplugs or a finger inserted below the equator is not gay. A penis is not being inserted into his body.
As a bisexual woman with trans friends I will say this on every relevant thread I comment on:
These people DO NOT speak for he vast majority of LGBTQ+ people. It is even more offensive to me as someone who isn't heterosexual that I am being told to submit to someone else's definition of a dick being present in my relationship.
I like dick. I sometimes want to have sex with someone who has a dick. I also like vaginas. I sometimes want to have sex with someone who has a vagina.
A penis is not a necessity for sex.
A penis IS a necessity for penis in vagina sex.
It is not. That. Complicated.
I'm sorry this shit is being peddled as PC when it's just fucking nonsensical rubbish created by people SO eager not to offend anyone that they manage to offend 99% of the population - INCLUDING LBGTQ+ people.