Not sure what version of scripture you are using for that verse but it says to avoid fornication a man should have his own wife and a woman should have her own husband. I suppose you could infer that husbands and wives should have sexual relations but the verse you posted doesnt exist as written in any Bible I can find.
...the verse you posted doesnt exist as written in any Bible I can find.
HMMMmmm...
http://www.biblegateway.com/passage/?search=1+Corinthians+7%3A2&version=NIV