Male lions get erections the same way as males of other species, either spontaneously or upon arousal.
yes because they are males so yes they can
A lot of the time, men will get "random" erections. It's normal, and it happens to all males.
No he can not there's no sperm in his penis he can get hard and play with his self or have sex with people but he can not make iny children
Yes they do experience, mostly due to dreams and fantasies, most of which come unconsciously.
Actually, erections have nothing to do with it. Once a month, males do have random moods swings and are generally slightly more temperamental. Random erections only effect males going through puberty, and don't happen monthly, but rather at random times.
Males have erections before they are even born and experience them frequently throughout childhood and even sometimes when they are fully adult. Almost all of times the get an erections, it not due to sexual arousal it is simply something that "just happens". Baby boys often get erections while still in the womb.
Pre-pubecent males tend to not notice erections, or they try to make them go away. Usually, if a male is aware of an erection, it is because he is thinking about sexual or seeing sexual things. An odd question, but certainly answerable- to some extent.
Hell no, because then they would always be hard. It's when the blood vessels in the penis pressurize
Yes, in the same circumstances as straight men (only, generally not because of a girl)
Erections assist with sexual reproduction, to aid penetration.
I'm afraid there's no way to stop erections. Erections happen to every man