@Blacksheep you're right that women love it when you fuuck their brains out, but you can have these effects without the pill. You simply need to be more assertive with women in the bedroom.
If you feel like you're losing your boner then think about what she can do to turn you on, then tell her to do it. Sometimes I'll lose my boner because I'm losing interest, so I'll start spanking her or tease her or bite her tits, or whatever I feel like enjoying in that moment.
Women love a man that can let loose and really enjoy the moment without getting caught up in his head.
That's how life is supposed to be in general, you shouldn't have to consciously think 'ok I will now will my erection', it just happens naturally when you're in the mood, so just set the mood.
Just like you don't consciously think about every muscle in your legs when you walk or run, it's just automatic because you've ran lots. You've gotten lots of boners and gotten off lots, it's the same thing.
It's probably ok to use the pill temporarily, but it's definitely not needed. Just get out of your head and command the moment into the perfect mood. Like directing the perfect porn for yourself, starring you and her.