Jennifer, If you've had your tiger for two years, then it's probably unlikely that he/she's gravid (with eggs). As David has mentioned, sex of most caudates is usually determined by the size and/or shape of the cloaca (the "genitals" of a salamander, if you will). A large/swollen cloaca would indicate that your Homer is probably male, while a smaller, less defined cloaca would probably indicate that Homer is a female (Doh!). Sorry, couldn't help myself. Anyway, it's sometimes hard to differentiate, especially to the untrained eye. If you could take detailed pictures of Homer's cloaca I'm sure a combined effort of us all would help to determine the sex of Homie (as Marge would say). As far as parasites are conserned, a stool sample check by a vet would help to determine if they are present. While parasites aren't "deadly" (their goal is to live off their host, not kill them), they are undesirable. Jennifer, you've come to the right place- the people at caudata.org are some of the nicest people on the net.
P.S. Sorry for the Simpsons references, I'm not sure if you even named your Tiger after Homer J. Simpson or if you've named your Tiger after the poet. I've had a few glasses of wine and absinthe, and I couldn't help myself. Take Care!