Routinely avoid these type of threads. Answer would be different in each but all equal to: I do not know.
Sex doesn't (or didn't) change my anxiety levels and I don't understand why it would other than during the act? Being around strangers was still hell at times.
The emotional support a serious partner gives you is good but social anxiety can be complex so a thinking that being sexually active is a cure is a bit silly. If your issues are a fear of intimacy then maybe relaxing enough to have a full sexual relationship with a person would remove your anxiety.