i can fully attest to MY facts...not having sex for an extended period of time CAN cause certain mental issues (more emotional, though).
and yes, from a personal few...not having sex, CAN cause anxiety.

you slowly go insane from lack of communion with another human being and can get very very lonely.

this is of course MHO...and also, usually can happen to folks who have had long term intimate relationships with one person (usually a spouse).

of course i don't know if there is any scientific or psychological research on the subject, i'm sure there is somewhere---i speak of personal experience. my wife passed over a year ago, i have been alone since and though i already had social anxiety, it has gotten worse, depression has gotten worse and being lonely really can cause mental issues, anyway.

it's more like an absence of intimacy with another human being, we ALL need it to survive life, whether that intimacy includes sex or not.

I think it's because society tends to bundle other things together with sex. Like I can miss companionship and non sexual touch because a lot of people expect their SO to be their companion/best friend/cuddle buddy/lover. I don't think the lack of sex would be so difficult if it was easier to get companionship and non sexual touch outside the sexual relationship. This is considering that self pleasure is always an option to take the edge off sexual frustration.

I didn't have sex until I was in my thirties. It was different for me though. I have major Social anxiety and APD so I am very anxious around people so it was hard to be comfortable around people. You don't have sex if you don't want to. When you are ready, you'll know. Hopefully you will find the right person just do what you're comfortable with. Remember, don't push yourself or do what the other person wants to make them happy. You want both of you to enjoy the experience.

Well this is tricky I can’t really be sure one way or the other, I am 40 and male and have never had a girlfriend, no casual sex it is of no interest to me, I do get a pretty down because I wish for tactile contact but I can’t make people care about me or be attracted to me so no real use in it. Does it cause anxiety disorders I don’t think so, but a given body will build up sex hormones that can be mostly dealt with through masterbation, but the need for physical and psychological contact plus emotional connection, is another thing.

Sex is great for releasing stress and physical contact. I don’t personally think not having sex causes anxiety, especially if you’re not having sex to begin with. If you don’t want to have sex, then don’t...and don’t let anyone pressure you into doing something you’re not comfortable with...that will cause anxiety. Stress can build up if you’re having sex and then are not for a while...but I don’t think it does if you’re not having sex to start with. Xoxo

I don't think so, necessarily. just look at nuns, lol. if youre fine then I wouldn't worry about it. a lot of ppl have anxiety and other issues and have IT, so it's obviously not that. I think it's moreso this culture that is so sexualized, and, as a girl, guys will try to pressure you and act like theres something wrong w/you if you don't. sure, it's enjoyable, but actually dealing w/men just seemed to cause more issues and stress and anxiety and depression. so, as a girl it's hard to really know bc it seems like you can't ever have your own experience or just do what you want w/o dealing w/other ppl and their judgements and criticisms.