To start with, I think there could be some apprehension depending on the girl. In some cases, it could make her feel uncomfortable or insecure, thinking that the guy doesn’t satisfy her in bed anymore. It could also be an indication of him looking for something out of the ordinary compared to average sexual activity. So, in those cases, it could be difficult for her to accept.
At the same time, though, I’ve seen relationships where the girl is totally okay with it. The intention could be to expand pleasure for both partners, for instance. Maybe she doesn’t feel as turned on as she should everytime they make love. In such a situation, it could actually bring the relationship closer, as partners are working together to figure out what works best.
That said, it’s important to keep the larger context in mind. As far as the girl’s opinion goes, there are many factors to consider such as her comfort level, her relationships with her partner, and her overall view on sex. She might even be the more experimental one in the relationship. All of this would come into play and should really be discussed in order to build a solid foundation for mutual understanding and fulfillment.
In any case, I think it’s important to be honest and open with each other. Clear communication is always key and without it, it’s very hard to find a good balance in a relationship. To illustrate, I remember a friend of mine who was really shy when it came to talking about sex toys and vibrators often avoided the conversation. After years of being together and gaining trust in each other, she found it easier to let her inhibitions go and things got much better.
For me, I believe that it’s up to the couple to figure out what works best for them. In the end, it’s all about understanding each other and respecting each other’s boundaries. There’s no ‘right’ or ‘wrong’ answer when it comes to matters like this—as long as the result is consensual and both partners agree with it, then it’s all good.