This sounds a far cry from the subject of sex, but seeing that it stands for spiritual maturity, which determines to a large extent how we order our behaviour, it becomes very relevant.
God created male and female, and that means that the complex creature called homo sapiens is physical, mental, spiritual and sexual. We have to admit however, that sin has wreaked some terrible havoc in the area of sex.
St. Augustine was quite a libertine in his teenage years, but after his conversion to Christ he reacted violently against sexuality in general. We could call it the pendulum syndrome. He took strong views against immorality which he seemed to have equated with sexuality, and so came to some unfortunate conclusions. For instance, the Bible does not necessarily stipulate that chastity demands celibacy, although that may at first sound illogical, but in Titus 2:5 there is a surprising statement for the St. Augustine school. The young married women are told to love their husbands, (so they were wives), and also to love their children (so they were mothers). It then goes on to tell them to be discreet and chaste; so chastity in this context is not the same as celibacy, but rather the right use of one's sexuality. "Marriage is honourable in all and the bed is undefiled". (Heb. 13:4).
Indeed partners living in faithful marriage are heirs together of the grace of life and they enjoy special grace from God and Jesus in His sermon on the mount implied that it is possible for anyone (including celibates) to be unchaste in thought, so there you have the paradox in Scripture of a married person who is chaste and the possibility of a celibate being unchaste!