I'm writing a family and expect the children to age from 8, at the start, to their early twenties, by the end. Naturally, there'll likely be sexy nonsense at some point in their later years and I'd like a few readers to fall in love with them ideally; they're a kind, attractive pair of siblings. What I want to know is if any part of this would make you uncomfortable as a reader, e.g. coming across a sex scene knowing that yesterday you were reading about them as a ten year old OR starting again from the beginning and knowing that you'd soon be reading about them having sex. I guess it depends on the length of book between the parts where they're kids and when they're sexy? Also, do you think the gender of the character affects this?