If you are in a happy relationship you should be able to talk about anything really. Because that's what love is, or something like that. That's obviously not always the case, if you absolutely hate her parents, it's probably going to be difficult to approach that situation in a constructive way.
The same can also be said for asking for anal, well for this guy anyway. Sick Chirpse reported on this young Edgar Allan Poe who had no idea how to pop the question so decided a home-made Valentine's Day card would be the ultimate romantic gesture.
Because nothing says true love like 'I'm bored of normal sex with you let's try something else.'
To be fair to him, this is some A * arts and crafts and a real commitment to the cause.