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Little research has been conducted on the effect of hormones on reproduction motivation for same-sex sexual contact. One study observed the relationship between sexual reproduction motivation in lesbian and bisexual women and period-related changes in circulating estrogen concentrations.  Lesbian women who were at the estrogen peak of their fertile cycle reported increased reproduction motivation for sexual contact with women, whereas bisexual women reported only a slight increase in same-sex motivated sexual contact during peak estrogen levels. Interestingly, both lesbian and bisexual women showed decreases in reproduction motivation for other-sex sexual contact at peak estrogen levels, with greater changes in the bisexual group than the lesbian group.
So while this starts to answer your question with regard to mechanics and erection potential, it does not really get into the all-important emotional and psychological piece. I think that any time our bodies and our minds are not quite in alignment that there can be an emotional toll. This is in no way to say that all transgender people have emotional problems, but I just want to recognize that our bodies, our gender, and our sexuality can be confusing even when everything lines up. Having the added challenge of feeling uncomfortable with one’s physical sex can add some complications.