is he cheating if unexplained semen stains appear in underwear

I'm 99.9% sure he's masturbating, not cheating. If he were having sex it seems unlikely there would be semen stains in his underwear.

Almost all men and boys past puberty have uncontrolled leaks of small amounts of pre cum and semen any time they get erections, which is countless times per day for most guys. Its perfectly normal for all males to have erections at any and all times, very frequently, without sex, and often for no reason other than their penis feels like erecting for exercise, or tight pants, bumpy car and bus rides, thinking of sex, running, biking, sports movements, exercise, and endless other completely innocent causes.

Don't ever assume sex is the only way healthy males have semen coming out of their penises. The list of other reasons is almost endless, especially in younger males and men who get erections and leak pre cum and semen much more than older men do and with little or no reason.

I don't think you'd appreciate your man speculating on what causes every stain on your underwear and clothes. Give your man some privacy and let him be a man. Every guy leaks semen because we produce millions upon millions in our bodies every day and the sperm need to get out somehow to relieve all that built up pressure inside the testicles and male glands every day, no matter what.

No, it does not mean he's cheating at all!

It's just like girls having stains of vaginal secretions on their underwear. It would be crazy for him to think you were cheating on him because he spotted some female goo in your undies!

Guys leak fluid that leave stains in their underwear frequently. It may be precum or even cum from wet dreams or spontaneous ejaculations. I often get these and soak my undies inadvertently. Even for guys who don't get wet dreams or spontaneous ejaculations, they often leak large amounts of precum when aroused.
If anything, it points to him being faithful and not releasing his juices enough!

My bf of 7 years has been out for two days missing partying he comes home I go to wash is clothes and see white stains in is boxer shorts I confront him he try's to tell me es had a wet dream staying on is mates sofa he must think I'm a id**t ' he's been binbagged !

He probably did that happens to guys a lot and uncontrollably if he had sex he would nut on the chick or on his mate if it was him it would not be on his underwear

If your husband, boyfriend has seman in his underware you have every right to be suspicious. You should ask him. If it's such a natural thing then he should be glad to ease your mind.

I am having the same issue. I dont usually see cums on my husband's undies. But i see them today. On the inside front of his undies. What's bugging me is i found a crystal like stain on the garter part. I think it is from a woman. Because i think sperm is only powdery white when it is dry. The one i found in his garter is shimmery. Please really need answers. Its not like i cant confront him right away and that he would not lie if he is cheating.