If abstaining from sex is keeping one pure, then having sex makes one impure.
And anything that makes one impure is sin.
By your reasoning, then marriage and sex are sinful and it's better to be single.
If singleness were better, then perhaps you could explain why God created man and woman and created sex, and ordained and blessed marriage and the marriage union.
If singleness were better, God would not have created a WIFE for Adam nor would He have given men and women a sex drive and made it pleasurable for them.
He could have had people reproduce by budding or some other means that didn't involve sex.
Marriage is God’s will for the majority of people. Scripture celebrates both marriage and celibacy.
Whether one is married or single, it should be to the glory of God.
A celibate man or woman of God who is wedded to the LORD in both body and spirit is qualified to share his or her wisdom to a married couple who are wedded in the earthly sense.
John the Baptist was single but I would trust his marital advice.
“If abstaining from sex is keeping one pure, then having sex makes one impure.”
Your logic failure here is astounding. And then you note it yourself by saying: “And anything that makes one impure is sin.” Yes, and sex outside of marriage is sinful. Sex within marriage is not. Thus, having sex doesn’t make one impure unless its outside of marriage. Learn to think.
Also, if you knew scripture you would know that Jews - and Christians as we see from history - still believed in abstinence even within marriage for certain purposes. Apparently you’re unfamiliar with 1 Samuel 21:5.