True, abstinence is the practice of giving up something, it necessarily doesn't have to be all about sex, which is many average thinkers are taught in schools. It can be alcohol or even toys and games!
This is likely due to peripheral vasoconstriction. This happens in order for the body to retain heat longer in order to protect the body from hypothermia. The skin would act as an insulator of the organs and water. Also, when this happens, it would allow more of the oxygen to be transported to the oxygen sensitive organs like the brain and the heart.
The lysogenic phase of a viral infection is when the virus injects its DNA into the cell. Instead of the DNA being replicated and then formed into new viruses (lytic), the virus' genome is incorporated into the HOST DNA genome by Recombination.
Essentially the viral DNA inserts itself to the host genome, also has all of its mRNA protein coding regions deactivated to prevent it damaging the host. Think of it like a dormancy stage where it divides along with the host
