Do explain what hurts and what does not, where they can touch and where not and just how much pressure to apply, for example some pain is activated by a light touch, others much deeper. If you are the pain sufferer, honesty extends to telling your partner that you feel you want sexual contact or intercourse. This may be difficult if you are not usually the initiator of the contact. I remember one pain sufferer was most upset when she felt that her partner was ignoring her when she felt like intercourse some months after surgery. As I explained to her, how was he meant to know if she did not tell him how she was feeling.
Most people think of sexual contact occurring at bedtime.
Chronic pain does lead to fatigue and most sufferers only want a mug of cocoa at the end of the day, not sexual activity. There is no rulebook indicating that afternoons cannot be used. This could be difficult if you have small children around but this problem could be overcome with planning. Do time your medication in order that it is having most effect when you make love. There is no reason why TENS machines cannot be used whilst lovemaking, but do be aware that with movement you could have an increase or decrease of stimulation from the electrodes.