My ex wife will not let my daughter come to my house; what are my options?

Thank you for your question.  Sexual orientation is not a ground on which to deny visitation.  The ex wife is violating a court order without any justification.  You should file papers to not only enforce your visitation rights, but also use the ex wife's interference as grounds to request a modification of custody. Indeed, in Bienenfield v. Bennett-White, 91 Md. App. 488 (1992), the custodial parent attempted to prevent visitation because the non-custodial parent attempted to educate the child on religious views with which the custodial parent disagreed.  The Court found the custodial parent to be acting in bad-faith without justification, and modified custody in favor of the non-custodial parent.  Your argument may be stronger than the non-custodial parent's argument in Bienenfield, since Maryland has recognized same-sex marriage. Feel free to contact my firm.  I am an experienced family law attorney in Baltimore, and I would be glad to help.