My parents did not allow me and DH when we were engaged and weeks away from our wedding, to share a bed at their home.
I think this is up to you.
A child who is still at home and under the care of her family cannot impose her sex life on her parents if they find it uncomfortable.
Where has this idea come from that kids always get what they want just because they are legally an adult?
Quoting the 'age of consent' is ridiculous. That's a law to protect women (and men) from non consensual sex.
It is not meant to take the place of parental wishes when the 'child' is living at home.
I get so tired of this on Mumnet' She/ he is an adult'.
FFS- the 'adult' is a legal term for when they can vote amongst other things.
Emotional maturity does not have a timescale.
It's been shown by recent research anyway that adolescence lasts till 25.
It's about what YOU want OP.
Your home
Your feelings
Your emotions.
If she doesn't respect your feelings, she can move out or at least manage her sex life elsewhere.