What kind of mother allows that? I really feel sick over this. The LW is actually currently a part of this sex crime against her daughter. Do you want to be the kind of woman who just sweeps everything under the rug for the purposes of her own comfort? She is supposed to trust you to protect her, and you are willing to compromise her safety and security in her own home because you are too chicken shit to give up a man? LW, please, I beg you: He has ended your relationship with his behavior, so kick the bastard out.
State of Texas agrees with you, too.
“My New Husband Took Nude Photos of My Daughter”
Do you love your daughter? He probably has files on his computer of other teen girls, maybe pictures he took himself or pictures he downloaded. Then, say how you hope your daughter can trust you at some point and you hope that if something like this ever happens again she knows she can come to you and talk with you about it. The whole thing screams manipulation. Get you and your daughter to therapy.