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Just do what you are already doing. First, make it necessary to perform some spells; they require the energy of two genders joined. I might even make it distasteful to the female, but she does it o...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/39273 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/39273 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Just do what you are already doing. First, make it necessary to perform some spells; they require the energy of two genders joined. I might even make it distasteful to the female, but she does it out of necessity. I'd let the men volunteer. Yeah, they will be drained for a day or more, but sex for magic is the best sex there is, so it is worth applying. Let the witches be picky. Then your problem is a more normal problem, which you can conquer, writing a sex scene that isn't cringeworthy, You want it to be realistic given the attitudes of the partners and the goal of the witch. In many ways (under the scenario I have outlined) she is similar to a prostitute with a willing client; she has to bring him to orgasm, but she is not doing it for love or kindness, this is just manual labor, her job to get her pay (mana) and accomplish something else.