Finding out if your man is cheating on you by using Internet dating sites is not that hard to do. However, it can be time-consuming, especially if your guy is computer-savvy. If you have a gut feeling that your husband or boyfriend is in the market for an affair and your attempts to talk to him about the issue have failed, it may give you peace of mind to check whether he's looking online for other women to date.

Try to get the passwords that your partner uses for his email and any social networking sites that you know he belongs to. Check it out to see if he's responding to any flirtations or emails that are sent from online date places. Just because he receives email from a website does not necessarily mean that he's a member looking for an affair. It could be just spam. This is why you need to check if he's written back to anyone or been browsing the site itself.

Check the temporary Internet files and history log on your computer. Don't only look for obvious websites. When you're trying to catch a cheating man via the Internet, you have to look for more subtle clues as well. One trick a guy who cheats uses is to set up an email account that this partner doesn't know about to have his affair. If you see any of the major free email places in your computer's history that you aren't signed up with, it could be your husband has an account with one of them.

Check his phone for dating site apps, or try to catch a glance of his screen when he's using it near you. If you see any particular app, you'll know which site to check for his profile.

Install key-logging software onto your computer. This is especially helpful if your guy is the type to clear the temp and history files after he is done surfing the Web. When you're trying to find out if a man is using Internet dating sites to cheat on you, this software can be woman's best friend. Hide it on the computer so that he doesn't see it running. Check the record of what he's typed in whenever you have the time and freedom to do so, and see if he's looking for (or already having) an affair.

Check recent credit-card statements. A lot of online dating places have a monthly fee that needs to be billed to a credit card. Any item listed on the statement that seems the least bit suspicious should be checked out. You can call the credit-card company and ask for specifics, if you are authorized on the account to do so. You can also confront your partner about it, asking what exactly the charge was for. This kind of proof can make a guy confess to an affair all on his own.

Look over cell-phone records. If your spouse is looking for other women on online date sites, he's more than likely calling them too. If he does paperless billing, you'll need his password to check the call log on the phone company's website.

Register at the website yourself, if you find one that he's likely a member of. You may need to enter a credit card to search in depth, but many online dating sites offer free browsing of profiles. (You just can't contact the other members without paying.) Once on the site, you may need to do some creative searching. Browse by your general area, the city that your husband works in and his major interests; any of these may turn up results. You can very rarely find people by name. Even if your guy has his real name listed as public information on his profile, very few dating websites use names as a search option.

Hire a private investigator. If all else fails, you can always seek professional assistance. As infidelity experts, good private investigators know all the tricks of the trade when it comes to finding out about a husband who cheats. When it comes to figuring out how to find a cheating man on Internet dating sites, they may have a lot more luck in getting proof of your guy's online affair than you.