The general advice is if you are wishing to avoid a pregnancy to assume estrogen won’t make you sterile (and use protection), and if you are hoping to have kids assume it will make you sterile (and get fertility services like freezing sperm before starting HRT).
Estrogen also causes penile atrophy, so the phallus may not be as capable of penetration as before HRT.
From the OP’s inappropriate title, I assume they are coming from the context of pornography, where the actresses are using methods to prevent penile atrophy (most porn involving trans women do not show women with penile atrophy), but in those contexts they are also likely taking steps to avoid pregnancy so the question clearly veers outside of the initial context.
The general advice is if you are wishing to avoid a pregnancy to assume estrogen won’t make you sterile (and use protection), and if you are hoping to have kids assume it will make you sterile (and get fertility services like freezing sperm before starting HRT).
Estrogen also causes penile atrophy, so the phallus may not be as capable of penetration as before HRT.
From the OP’s inappropriate title, I assume they are coming from the context of pornography, where the actresses are using methods to prevent penile atrophy (most porn involving trans women do not show women with penile atrophy), but in those contexts they are also likely taking steps to avoid pregnancy so the question clearly veers outside of the initial context.