From my understanding, when you have lustful thoughts, the semen changes from subtle to physical form. Below is something is found online regarding this, saying that if the semen manifests into physical form, that it will be expelled through a wet dream or through ejaculation.
Is it true that physical semen that is not in subtle state, is useless to the body and cannot be converted back into ojas??
Below is what I read:
"An important fact unknown to most people is that Rethas (semen) gets into the 'ejaculatory mode' even through fantasy or sexual contemplation without ejaculation. Each and every time sexual thoughts are let to flower and develop the 'Ojas' that the Brahmachari has conserved reverses into Rethas (semen) in the ejaculatory mode and becomes sexual in nature. Once 'Ojas' reaches this state, it has to be thrown out. There is no other alternative. Rethas (semen) which is being produced by the body can be converted to 'Ojas' through conservation and transmutation but the 'Ojas' which is thus produced, if reversed back into Rethas (semen) through sexual fantasy cannot be re-converted to 'Ojas'. It is a unidirectional process and not bidirectional. Suppose a man spends a few minutes each day fantasizing on the opposite sex and but does not ejaculate or masturbate, a certain percentage of his 'Ojas' reverts back to Rethas. But he has not masturbated or ejaculated, so this reconverted Rethas stays as physical semen. After a few more days or weeks of continued sexual fantasy, more and more 'Ojas' reverts to the Rethas state, a little at each fantasy. Once this volume of degenerated 'Ojas' that has been reverted to the Rethas state reaches a certain volume, the body expels it through a wet dream or even an ejaculation in the wakeful state through some form of physical stimulation. "
Please clarify this for me.