Not necessarily. Some people interested in trans people are certainly just looking for sexual titillation (not that that's necessarily a bad thing), but others are just as sincere about pursuing a meaningful, romantic relationship as anyone. Personally I'd be just as happy dating a transgendered female as a non-transgendered one; I don't see this (and hope a potential partner wouldn't see this) as a scary aberration so much as simple impartiality about what is, or used to be, between their legs. While I am attracted exclusively to females, I'm infinitely more interested in their personality and, as far as physical attributes go, their face, then in their genitals and sex chromosomes.