Is it possible to have a non-contagious virus that can be transferred between people during unprotected sex? I'm not talking about STD's, I'm asking about a theoretical virus that could attach itself to the Y chromosone in a male and be transferred to a woman during sex, in whom it would lay dormant, eventually attaching itself to a male baby during gestation. I know this is bordering on Science Fiction, but it is nessecary for a novel I am writing.
Anyone with information about or examples of a 'species' of virus that could fit this description would be helping me greatly. Multiple answers are encouraged, and any recommended reading on the subject would also be useful.
Thank you all for your time.

You could, pehaps, design a virus capable of substituting sequences on the Y but that is science fiction. As far as I'm aware no naturally occuring virus does anything other than co-opt a cell into producing more virus'.
If I may suggest an option for your story go google mimivirus. These fellows are biiig, you could pack a lot of information inside one.
Of course it's possible that they may not be virus' at all but don't let that get in the way of a good story.

Oh and pay a visit to virology.net or .org, Good place to start

Dee Cee.

Is it possible to have a non-contagious virus that can be transferred between people during unprotected sex? I'm not talking about STD's, I'm asking about a theoretical virus that could attach itself to the Y chromosone in a male and be transferred to a woman during sex, in whom it would lay dormant, eventually attaching itself to a male baby during gestation. I know this is bordering on Science Fiction, but it is nessecary for a novel I am writing.
Anyone with information about or examples of a 'species' of virus that could fit this description would be helping me greatly. Multiple answers are encouraged, and any recommended reading on the subject would also be useful.
Thank you all for your time.

um... just a suggestion.

viruses aren't exactly living things, so it's hard for them to actually act like living things. (uhh, not sure if that has anything to do with your dilemma). they;re made to attack cells, transfer their dna inside, and make lots of other happy viruses from the infected cell. isolating the virus to become dormant in a y chromosome is something im not sure that can be done, considering that a lot of potential victim cells are around it. (pls forgive me if im wrong about this)

what you can also consider is a genetic mutation that occurs in the y chromosome of the male in that particular generation of gametes. so, when the mutant gene carrying sperm fertilizes the egg cell, lo and behold, they have a son with a genetic disorder.

Thank you both for your help. I will certainly now be able to figure something out.

Your question is very specific, and it has been answered as such. But a virus is capable of mutating at a fast rate under the right breeding environment. Therefore, unprotected sex could cause a virus to mutate into a deadly form. But after attaching itself to a Y chromosome, you're no longer in a mutational environment. You're in the realm of genetic translation: genotype and resulting phenotype. The answers above are right on track.