Busy social lives and heavy work schedules are said to leave most adults too exhausted to enjoy intimate moments
A survey of 3,000 people found that in the last month more than one in two people have turned down their partner's advances because they were worn out.
One-in-five have said 'no' this week and two thirds admitted they only have time and energy to make love at the weekend.
It was also found more than half will automatically say no after a certain time of night… so you'd better make you advance earlier next time.
Top 5 reasons for being too tired for sex
1. Not getting quality sleep
2. Long working hours
3. Partner comes to bed too late
4. Children wake us up early/keep us up late
5. Busy social lives
A spokesperson for Pharmaton Vitality Capsules, which commissioned the study, said: "After a long day at work or looking after the family, it seems many Brits are tired of feeling tired and unable to do anything else but sleep once they crawl into bed.
"Instead of having some quality time with their other half beneath the sheets, it seems many would rather just catch up on their rest."