Most Helpful Guy
I am not sure what you mean by modest. It depends on both your definition of modest, and what type of guy you are wanting a relationship with. If you mean you don't wear revealing clothing or sleep around, a lot of guys struggle finding those types of women to marry. This can be a turn off for guys not wishing to get married, or who want sex early in the relationship before he has decided to marry her.
If by modest you mean that even in a relationship including marriage you always need the lights off during sex and never let your husband see you naked, then most guys will have a problem with that.