I have been thinking about this today so I thought I should discuss it……
I am fully embracing semen retention and male chastity. Having worn my “chastity cup” for more than 12 hours as of this morning, I feel an almost constant arousal. But I don’t always have an erection! This is an interesting feeling. I remember seeing videos of guys in male chastity cages constantly leaking precum. But they do not always have an erection. I notice lately that while in my cup, I almost always have a little leakage going on. So does that mean that I am aroused? I think the answer has to be “yes”! I can definitely feel it! I will call this “back-door” arousal.
Usually, for young guys not in chastity or practicing semen retention, their arousal usually comes pretty quickly in the form of an erection. I will call this “front-door” arousal. The erection, if sustained by sexual activity or thoughts, will precipitate full-blown arousal usually followed by an ejaculation, either through masturbation or intercourse. In my case, since I have no expectation of ejaculation through masturbation or intercourse while in chastity, I have to “settle” for leakage or, at best, a wet dream. I have not experienced a wet dream yet, but I know it is now only a matter of time. I am getting more aroused with an erection more spontaneously now. In fact, when coming out of chastity for a brief period of time, I am almost guaranteed to get an erection and pretty quickly. I also have some sexually-explicit thoughts while in bed, usually cock-related. This is a good sign.
Arousal is arousal—yes, but back-door arousal has to be experienced through semen retention and/or male chastity. That is the arousal that I prefer.
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Source: https://www.aneros.com/blogs/front-door-vs-back-door-arousal/