Yes, within households and extended households you can have sex if:
you live with your sexual partner, you are both feeling well and you both consent to sex.
you are in an extended household with your sexual partner, you are both feeling well and you both consent to sex.
You should avoid sexual contact if:
you have been advised to self-isolate (because of COVID-19 symptoms or contact with COVID-19)
you or a sexual partner has a medical condition that may lead to a more severe illness with COVID-19 and have been advised to shield. If you have symptoms of COVID-19 you should self-isolate for 7 days to prevent transmission to other people and visit NHS Inform to arrange a COVID-19 test. If someone you live with or someone you have recently had sex with has symptoms then you need to self-isolate for 14 days and contact NHS Inform for a test if you also develop symptoms. Self-isolating means no physical contact – no hugging, kissing or sex, and you are advised to sleep separately.