Personally, I love it when an author inserts a well crafted and strategically placed scene in which the characters fumble, struggle, strike out, or somehow "misfire". I think it makes characters more real, more vulnerable, and most importantly, more relatable. This is particularly the case when the author is able to show that the hero/heroine can get through the situation with finesse and that, as a result, they experience a more profound sense of intimacy.
There are some important key elements to making this sort of scene work for you.
Regardless of the failure, your hero/heroine must stay in character. You don't want the reader to suddenly feel as if two entirely different characters are introduced.
Remember that you are striving for vulnerability and reality. The situation should be believable. You don't want it to come off as comical and you don't want to make the reader too anxious or afraid. Be subtle.
Use humor carefully. No one wants to be laughed at or feel like they are being ridiculed when they're naked. Remember that your characters are bare not only physically during an intimate scene, but emotionally as well.
Keep the sexual tension high and the pacing steady. Lead both your characters and the reader down the garden path and then surprise them by inserting an obstacle.
Acknowledge the obstacle. It's better when one of the characters is able to do this rather than relying merely on narrative.
Have the characters talk through the obstacle to normalize it. This will show the reader that they have the strength to get through those mundane relationship issues that are necessary to conquer if they're going to have a long-lasting relationship. sex stories
Often, I hear from wives who ask if their husband was being unfaithful or having an affair if he didn't have sex with the other woman. I often get comments like these: "My husband has been having lunch with and seeing someone else, but hasn't had sex. Is this cheating?;" or "My husband has been seeing a coworker, but he says they've only kissed and have not had intercourse. Is this still infidelity?;" or "Is cyber cheating the same as an affair?" I'll answer these questions in the following article.
Would Your Husband Share This Relationship With You? Did He Try To Hide It?: Often I tell wives that I consider any relationship that you husband didn't share with you to be suspect. In other words, if he kept all of the lunches and the encounters to himself, then clearly he had something to hide or wasn't at all comfortable with what he was doing (and knew that you wouldn't be either.)