Stored Procedure Dynamically Determine Columnname

I want to dynamically determine which column I select data from. The table I want to select from looks like this:

tblSexuality
SexualityID int PK
EN nvarchar(20)
NL nvarchar(20)
DE nvarchar(20)

Based on the value of variable @LanguageColumnName I want to select the value from either column "EN", "NL" or "DE"
In the sample below the value of @LanguageColumnName is "NL".
Unfortunately the value of sexualityname is ALWAYS: "tblSexuality.NL" and not the value from that specific column...how can I alter my procedure so that it does the select the value from that column?

ALTER PROCEDURE [dbo].[spFindUsers]
@LanguageColumnName nvarchar(3),
@startRowIndex int,
@maximumRows int
AS
BEGIN
SET NOCOUNT ON;

declare @tblSexualityName nvarchar(40)
set @tblSexualityName='tblSexuality.' + @LanguageColumnName
SELECT UserName,UserCode,ThumbNailPicture,BirthDate,ShowAgeOnly,
IsMale,NearestBigCity,DistanceToNearestBigCity,Description,
IsDonator,IsVIP,SexualityName
FROM
(
SELECT
ROW_NUMBER() OVER (ORDER BY UserCode) as RowNum,
tblUserData.UserName,UserCode,IsDonator,IsVIP,Description,BirthDate,IsMale,ShowAgeOnly,
tblCountries.CountryPicture,@tblSexualityName as sexualityname,tblCountries.CountryName,ThumbNailPicture,LastActivityDate,UserRanking,NearestBigCity,DistanceToNearestBigCity FROM aspnet_Users
INNER JOIN tblUserData ON aspnet_Users.UserId = tblUserData.UserID
INNER JOIN tblCountries ON tblUserData.Country=tblCountries.CountryID
INNER JOIN tblSexuality ON tblUserData.Sexuality=tblSexuality.SexualityID
) as MemberInfo
WHERE RowNum > @startRowIndex AND RowNum <= (@startRowIndex + @maximumRows)
END