Will there be any harm in letting my 100 ish kg girlfriend sit on my lap for extended periods of time?

Also curious if anyone else has slightly heavier than average partners of whom they let sit on their lap

And if so does excess weight make it uncomfortable/less enjoyable, and could there be any physical issues around this as well?

Will there be any harm in letting my 100 ish kg girlfriend sit on my lap for extended periods of time?
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