II Samuel 11:4

Then David sent messengers to get her.  She came to him, and he slept with her.

I may be wrong, but I don't believe David was the only one at fault here.  Sure, he was the king, but I think had Bathsheba said no, that would have been the end of it.  It says here, "She came to him", not "He took her".  And when God punishes the sin, both David and Bathsheba suffer (II Samuel 12:13).  I believe Bathsheba was equally guilty in their transgression.

Why did Bathsheba do it?  Probably because she was lonely.  She was an army wife, one whose husband was so loyal to those with whom he served that he put them ahead of his own wife (II Samuel 11:11). 

Perhaps you know Bathsheba's loneliness.  Maybe you're married to a military man who is gone for long stretches of time.  Maybe your husband doesn't travel, but he works long hours at the office.  Perhaps he spends weekends on the golf course or in a fishing boat.  Or maybe it's ministry.  He may be serving in a position that requires him to be on call twenty-four hours a day.  Whatever the reason, too often you go to bed alone. 

If this is your story, I caution you to remember he is still your husband.  While it may be helpful to seek out friendships to help fill the void, do not seek other men to help counter the loneliness.  What starts as an innocent friendship can all too quickly lead to trouble.  Remember what the writer of Hebrews said, "Marriage should be honored by all, and the marriage bed kept pure." (13:4a)  Honor your God by honoring your vows.