@Linkat,
First of all, I am not normal, nor do I have any desire to be normal.
Second of all, I don't believe it is healthy to worry about offending a romantic partner. There are two people in a relationship, what might offend people in a general sense is irrelevant.
I am only worried about what my partner wants or needs. Obviously once I learn about what upsets her, I will respect that. If I ask her her weight, and she is offended, she can tell me that she is offended (or she can leave, but that means that the relationship never would have worked anyway). I like relationships that are open and free. Some people are sensitive about their weight, others don't care. The way to learn about your partner is to ask her weight.
I had a time in my life where I would try to act "normal" when I started dating someone. It didn't go well... eventually I have to be myself, and if the other person is looking for normal they end up disappointed. I learned to be my odd, opinionated self from the very beginning of a relationship and I have found it works much better... the people who find me attractive stay (and the people who don't take off much sooner).
My current relationship is ridiculous. It breaks social convention. It is irresponsible. Many people would disapprove (and some have). It is also exciting, thrilling and adventurous. I treat her with respect (as she defines it). It is something we both want as consenting adults; we have talked about what we want from this relationship and we are doing exactly that.
There are social conventions about what is good in a relationship. They don't interest me. I want my partner to feel respected... what other people think is respectful doesn't matter.
Yes, it is fun to live in a fantasy world... especially as part of a fulfilling sexual relationship. The point is what matters is what the two people involved in a relationship want; what is "reasonable" means nothing.